How do these work?
I did setup auto redirect on firefox to invidious (yewtu.be) and it works well enough. I will just change redirect when it stops working. No need to be perfectionslist, just make it seamless and voila, no ads or recomendations :)
How does one go about doing this?
Desktop: LibRedirect browser extension.
Android: Install an app that can open YT links (like LibreTube), and set it as default handler for YT links in the settings. Alternatively Firefox Beta can use regular browser extensions, so LibRedirect should work there as well.
For iOS, you can check out Privacy Redirect
It literally just came out, but grayjay is already feeling better than both piped and invidious in my experience.
Link to an instance please
It’s not an instance. It’s an app. https://grayjay.app
Piped is better for privacy because it proxies everything through the Piped server, with Invidious you still leak your IP to Google. I also prefer the UI of the Piped web client.