https://torrentfreak.com/youtube-orders-invidious-privacy-software-to-shut-down-in-7-days-230609/
***EDIT***
These serve the same purpose as [Invidious](https://docs.invidious.io/instances/), but are separate projects. Each has its own features.
- https://piped.video/ / [instances](https://github.com/TeamPiped/Piped/wiki/Instances)
- https://viewtube.io/
- https://tube.cadence.moe/
If you just want to watch videos without clicking through to jewtube, you can use [yt-dlp](https://github.com/yt-dlp/yt-dlp). It's a command line program. There's an optional GUI to install separately if you really want that, but I haven't tried it: [yt-dlg](https://yt-dlg.github.io/yt-dlg/). If you already have a working installation of [Python](https://www.python.org/) then both can be installed with `pip`.
- https://pypi.org/project/yt-dlp/
- https://yt-dlg.github.io/yt-dlg/
(post is archived)