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 dont know if can help but if you search the direct server to a specific instance maybe can jump the problem. For example: lunar.icu instance can work if you search piped.lunar.icu or kavin.rocks instance by piped.kavin.rocks. Sometimes if the instance work can be useful