

Like most any paid VPN service they need to track bandwidth usage somewhat. They can’t see what you’re accessing but they can see how much of whatever it is. Windscribe also offers a free 10gb/mo plan so they do track it for that purpose as well, much like any VPN with a free tier would.
UBO and custom DNS works for me in FF. Sometimes I still get blocked so off to an Invidious instance I go (and they’re ad-free too) to watch whatever content I was trying to view.
ETA lots of people use DNS to proxy to Albania which yt doesn’t run ads for that region, they report it works fine but I haven’t tried it personally