I didn't keep track of which URLs were considered invalid, just those that were still considered valid when I tried playing them in VLC; notably, nearly all of the sports streams no longer worked.
Below is the single M3U file I exported from VLC, containing only those streams that worked at least once when I tried:
#EXTM3U
#EXTINF:-1,C-SPAN
http://cspan1nontve-lh.akamaihd.net/i/CSpan1NonTVE_1@312667/master.m3u8
#EXTINF:-1,C-SPAN2
http://cspan2nontve-lh.akamaihd.net/i/CSpan2NonTVE_1@312669/master.m3u8
#EXTINF:-1,C-SPAN3
http://cspan3nontve-lh.akamaihd.net/i/CSpan3NonTVE_1@312670/master.m3u8
#EXTINF:-1,VOA
http://voa-lh.akamaihd.net/i/voa_mpls_tvmc6@320298/master.m3u8
#EXTINF:-1,France 24
http://f24hls-i.akamaihd.net/hls/live/221193/F24_EN_LO_HLS/master.m3u8
#EXTINF:-1,CGTN America
http://api.new.livestream.com/accounts/7082210/events/7115682/live.m3u8
#EXTINF:-1,WSJ Live
http://wsjlivehls-lh.akamaihd.net/i/events1_1@174990/master.m3u8
#EXTINF:-1,Bloomberg Europe
https://cdn-videos.akamaized.net/btv/zixi/fastly/europe/live/primary.m3u8
#EXTINF:-1,CBS News
http://www.cbsnews.com/common/video/dai_prod.m3u8
#EXTINF:-1,ABC News 1
http://abclive.abcnews.com/i/abc_live1@136327/master.m3u8
#EXTINF:-1,ABC News 2
http://abclive.abcnews.com/i/abc_live2@136328/master.m3u8
#EXTINF:-1,ABC News 3
http://abclive.abcnews.com/i/abc_live3@136329/master.m3u8
#EXTINF:-1,ABC News 4
http://abclive.abcnews.com/i/abc_live4@136330/master.m3u8
#EXTINF:-1,ABC News 5
http://abclive.abcnews.com/i/abc_live5@136331/master.m3u8
#EXTINF:-1,CNN Test
http://cnn-lh.akamaihd.net/i/cnndebates_1@352100/master.m3u8
#EXTINF:-1,MSNBC
http://msnbclive-lh.akamaihd.net/i/msnbc_live01@180610/master.m3u8
#EXTINF:-1,Free Speech TV
https://edge.free-speech-tv-live.top.comcast.net/out/u/fstv.m3u8
#EXTINF:-1,Weather Network
http://d383mxeq7zv96c.cloudfront.net/api/ott/getVideoStream/USNATIONAL/master.m3u8?country=us
#EXTINF:-1,WeatherNation TV
http://cdnapi.kaltura.com/p/931702/sp/93170200/playManifest/entryId/1_oorxcge2/format/applehttp/protocol/http/uiConfId/28428751/a.m3u8
#EXTINF:-1,Adult Swim
http://adultswimhls-i.akamaihd.net/hls/live/238460/adultswim/main/1/master.m3u8
#EXTINF:-1,Toonami
http://amd.cdn.turner.com/adultswim/big/streams/playlists/toonami.m3u8
#EXTINF:-1,PBS Kids
http://live-cdn.pbskids.org/out/u/est.m3u8
#EXTINF:-1,7 News (WDHH-TV)
http://bcoveliveios-i.akamaihd.net/hls/live/246496/4744899807001/livestream/master.m3u8
#EXTINF:-1,District of Columbia Network
http://video.oct.dc.gov/out/u/DCN.m3u8
#EXTINF:-1,Fox 5 Washington DC (WTTG-TV)
http://api.new.livestream.com/accounts/2363281/events/1763520/live.m3u8
#EXTINF:-1,KOB4 News
http://api.new.livestream.com/accounts/10066184/events/3399986/live.m3u8
#EXTINF:-1,KXAN News
http://api.new.livestream.com/accounts/1506296/events/1569171/live.m3u8
#EXTINF:-1,NBC Bay Area (KNTV-TV)
http://kntvlive-f.akamaihd.net/i/kntvb2_1@15530/master.m3u8
#EXTINF:-1,NBC Bay Area Traffic Cam (KNTV-TV)
http://kntvlive-f.akamaihd.net/i/kntvb1_1@15530/master.m3u8
#EXTINF:-1,NBC2 News (KTUU-TV)
http://api.new.livestream.com/accounts/7987479/events/2929660/live.m3u8
#EXTINF:-1,NBC4 News (KNBC-TV)
http://knbclive-f.akamaihd.net/i/knbca1_1@13988/master.m3u8
#EXTINF:-1,NBC4 New York News (WNBC-TV)
http://wnbclive-f.akamaihd.net/i/wnbca1_1@13992/master.m3u8
#EXTINF:-1,NBC5 KFYR-TV
http://ad-playlistserver.aws.syncbak.com/playlist/898796/master.m3u8?access_token=eyJhbGciOiJIUzI1NiIsImtpZCI6IkdyYXkyMDE2MDgyOSIsInN1YiI6IioiLCJ0eXAiOiJKV1QifQ.eyJleHAiOjE3OTAzNjY5MTksImlzcyI6IldMUyIsIm1kNSI6IjUxNjkxOGMwODc3NDYzYzFhMWRmYzMwNGI2MWRkMDM3IiwibWlkIjoiODk4Nzk2In0.Vx7F9dBhtYzKs8GIhWg2CcEIRLjVA5548AT9KqIhM2w
#EXTINF:-1,NBC5 KFYR-TV alt
http://playlistserver.aws.syncbak.com/playlist/13353639/master.m3u8?access_token=eyJhbGciOiJIUzI1NiIsImtpZCI6IkdyYXkyMDE2MDgyOSIsInN1YiI6IioiLCJ0eXAiOiJKV1QifQ.eyJleHAiOjE3OTA1NDQ3MjIsImlzcyI6IldMUyIsIm1kNSI6IjlmZGUxN2VjY2IwNjg3ZDE4ZWZmMmYwNzkxNzkxMzlhIiwibWlkIjoiMTMzNTM2MzkifQ.JZ9ihQrHoiiQsFfQJ3cuyrEHAEWUktyrawJyVLsyQRo
#EXTINF:-1,NBC5 News (KXAS-TV)
http://kxaslive-f.akamaihd.net/i/kxasb1_1@5492/master.m3u8
#EXTINF:-1,NBC5 News (WMAQ-TV)
http://wmaqlive-f.akamaihd.net/i/wmaqa1_1@22923/master.m3u8
#EXTINF:-1,NBC 6 South Florida (WTVJ-TV)
http://wtvjlive-f.akamaihd.net/i/wtvja1_1@19309/master.m3u8
#EXTINF:-1,NBC 7 News (KNSD-TV)
http://knsdlive-f.akamaihd.net/i/knsdb1_1@71120/master.m3u8
#EXTINF:-1,NewsChannel 12 KTVZ
http://api.new.livestream.com/accounts/19128364/events/5285531/live.m3u8
#EXTINF:-1,NewsWest 9 KWES
http://api.new.livestream.com/accounts/2363281/events/1763520/live.m3u8
#EXTINF:-1,WBTV News
http://cbslocaltv-i.akamaihd.net/hls/live/221461/WBZTV/master.m3u8
#EXTINF:-1,WCCB News Rising
http://api.new.livestream.com/accounts/8522553/events/live/live.m3u8
#EXTINF:-1,WPLG-TV
http://wtvjlive-f.akamaihd.net/i/wtvja2_1@19309/master.m3u8
#EXTINF:-1,WUSA9 Breaking News
http://wusa-lh.akamaihd.net/i/WUSA_Breaking_1@98930/master.m3u8
#EXTINF:-1,WXXV25 24/7
http://api.new.livestream.com/accounts/22998687/events/6864865/live.m3u8
#EXTINF:-1,Fox News Talk
http://fnurtmp-f.akamaihd.net/i/FNRADIOHDS_1@92141/master.m3u8
#EXTINF:-1,Newsmax TV
http://ooyalahd2-f.akamaihd.net/i/newsmax02_delivery@119568/master.m3u8
#EXTINF:-1,CBN News
http://bcliveuniv-lh.akamaihd.net/i/news_1@194050/master.m3u8
#EXTINF:-1,KHZTV
http://rbc.streamguys.com/khztv/khztv/playlist.m3u8
#EXTINF:-1,Family Friendly Entertainment
http://54.225.64.228:1935/live/roku2/playlist.m3u8
#EXTINF:-1,JUCE TV
http://acaooyalahd2-lh.akamaihd.net/i/TBN03_delivery@186241/master.m3u8
#EXTINF:-1,Christian Hip Hop Television
http://telvuehls_t01997-i.akamaihd.net/hls/live/218552/T01997-2/playlist.m3u8
#EXTINF:-1,Rap Resurrection
http://edge2.tikilive.com:1935/unrestricted_tikilive/36008/amlst:amKEQ2Y2gYN4/playlist.m3u8
#EXTINF:-1,Hillsong Channel
http://acaooyalahd2-lh.akamaihd.net/i/TBN02_delivery@186240/master.m3u8
#EXTINF:-1,NRB Network
http://uni6rtmp.tulix.tv/nrbnetwork/myStream.sdp/playlist.m3u8
#EXTINF:-1,TBN
http://acaooyalahd2-lh.akamaihd.net/i/TBN01_delivery@186239/master.m3u8
#EXTINF:-1,CBN
http://bcliveuniv-lh.akamaihd.net/i/iptv1_1@194050/master.m3u8
#EXTINF:-1,WJZ 105.7FM The Fan
http://cbslocalhls-i.akamaihd.net/hls/live/219778/WJZFM-IOS/wjzfmlive.m3u8
#EXTINF:-1,WJFK 106.7FM The Fan
http://cbslocalhls-i.akamaihd.net/hls/live/204776/WJFK-FM-IOS/wjfklive.m3u8