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
Same for me. Started watching youtube videos in firefox with ublock origin, works perfectly fine.
On a side note, Smart Youtube for Android tv still works perfectly fine.