As others have already said that, this is caused by Google/YouTube, not Piped. (They should make that more obvious.)
Try another instance (Preferences -> Instance) until it works. The official kavin.rocks/kavin.rocks (libre) seem to be blocked by YouTube more often than other instances. The smaller the instance, the better (probably).
As others have already said that, this is caused by Google/YouTube, not Piped. (They should make that more obvious.) Try another instance (Preferences -> Instance) until it works. The official kavin.rocks/kavin.rocks (libre) seem to be blocked by YouTube more often than other instances. The smaller the instance, the better (probably).