On my self-hosted instance I started to get the error notification Sign in to confirm you’re not a bot - This helps protect our community. Learn more
Other youtube frontends have the same problem as it seems.
It looks like youtube is blocking IPs from access without sign in. But users have reported that using their actual cookie, got them banned. So that isn't really a solution.
It seems like the cobalt client might have solved it using OAuth tokens. That might also work for this project.
imputnet/cobalt#551