Comment by mrgoldenbrown

Look into LibRedirect and the projects it uses and also things like youtube-dl/yt-dlp.

https://libredirect.github.io/

https://libredirect.codeberg.page/

> A web extension that redirects YouTube, Instagram, Reddit, TikTok and other websites to alternative privacy-friendly frontends.

https://github.com/mendel5/alternative-front-ends

https://github.com/digitalblossom/alternative-frontends

https://www.privacyguides.org/en/frontends/

https://news.ycombinator.com/item?id=36146076

mpv understands URLs to these websites and uses yt-dlp to download them.

On KDE, I assigned an action to open some URLs with mpv, which means I can play then from the clipboard manager or the copy menu that is displayed when copying if it's enabled.