I pay for premium, but when I'm visiting my parents in another country, some premium features are deactivated, no more yt in background, sometimes even ads. Also sponsored blocks in yt videos. Like really, at this point on desktop &mobile i get a better experience by using ublock+sponsorblock compared to yt premium... The only problem is tv- I can't use ublock there and using some box for yt is not that nice: no remote support, sometimes worse chromecast support. An revanced app for tv would be a godsent