Because adblocking is free and if done right not detectable. I haven’t had a single issue with ublock on youtube.
I used to pay for premium but they keep upping their prices. At this point ublock on computers + revanced on phone is best way to go. Premium features without paying a cent.
Rewards? Oh yeah, less money in my pocket and price increases every few months? Sounds way more convenient than ublock and revanced. Rather pay with my money for an ad-free experience and line the pockets of a rich corporation. My time is too valuable to compile revanced once every few weeks!