Last two weeks every time I use Piped I am getting error “Sign in to confirm you are not a bot”. It happens on every instance and videos work very rarely. It seems like Google enforces you to log in if you try watch lot of videos from one IP. I hope this will not be end of Piped and there will be solution for this problem.
Upd. I got similar problem on Invidious recently
You can usually find an invidious instance if you look through redirect.invidious.io. For example, if I try the servers for https://redirect.invidious.io/watch?v=aQsWzL7_RiI the 6th one down currently works.
Yeah I usually just follow the “try another instance” links until one works.