many instances of piped and invidious won’t accept your connection if you’re not logged in with an account there. and now a lot of age-restricted videos on youtube won’t play through an alternative front end at all.
I have ways of virtuallizing multiple instances of the same stuff, I can just copypaste a youtube link into another instance of my browser full of userscripts for bypassing all of google’s garbage.
I hate those things.
Even when you do it correctly sometimes it won’t accept it