Seems like Piped and Invidious are both on their last legs. Public instances on both services are pretty iffy, they go down fairly often now. Freetube works well on desktop but no real way to sync subscriptions and watch history to a phone. Self-hosting Piped/Invidious might be the solution but I don’t know if it’s worth the upkeep when YouTube is actively fighting against it.
No bubble burst. One cannot know everything. I hate wasting time in things that cannot be done. I’ll try to use smart Tube for YT on my smart TVs. Thanks for your feedback .