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
I operate an invidious instance. Google has really cracked down the past two weeks on YouTube front ends. Its extremely frustrating.
Invidious devs are finalizing a workaround so hopefully things will be working again in the next week or two.