Unless they monetize the wanted Features Like Ad-Blocking. 10$/Month for No Ads everywhere is a Deal that many people would probably Take. Sponsorblock, DeArrow, Video Background Player Fix, there are many QoL Improvements that a Browser Company might include to sell a Browser Subscription or likewise
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But there are a Lot of people Out there WHO pay 15$ for YouTube Premium, If you can get way better content for that Money elsewhere