Now I’ve tried almost all of them in the Piped instances list (Several domain name for sale and server not found errors) and only the smnz.de one works for me. :( I am wondering whether a freshly installed self-hosted private Piped video instance will work fine.
Indeed. I tried on mobile with LibreTube and with Mull and both fail. And also fails now in Tor browser. The list is getting shorter.