How about the idea posted here: https://www.reddit.com/r/webdev/comments/15ukrpi/comment/jzo4xug/

Perhaps instead of randomising a string it could point to: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32016R0679 or something similar?

make it work with yt music pls

The userscript doesn't work because you're using a MutationObserver with the prop subtree, which is not guaranteed(at least on my browser) to be notified of all subtree changes, and, as a matter of fact, it doesn't get notified of the element you're looking for. I'd suggest using intervals like here.

Extension: Tampermonkey
Browser: Opera GX

At least on Violentmonkey, it won't match unless you have it like // @match https://www.youtube.com/*

Playlist URLs look like this: https://youtube.com/playlist?list=somerandomletters&si=trackingstuff

This script makes them look like this:

To replicate, just click the share button on any playlist. A possible solution would be only to remove the &si=* part if it is a playlist link.