I use Youtube on deck in Firefox with youtube.com/tv in kiosk mode. Works really well, but I noticed even when I have a bigger screen connected I can only watch videos in up to 720p. It doesn’t let me select anything higher. Is that a YTTV thing or is there a problem in my setup?
OP is talking about YouTube and I can watch 8KUHD just fine on Linux.
You’re right, subbed in Netflix for some reason - but Youtube TV though acts in the same way, I don’t believe they allow anything > 720. Free youtube is different, paid Youtube TV will throttle