The problem is that ad revenue brings in more money than subscription models ever can. So they're either super expensive because the company is accustomed to the high profits of ads, OR they inevitably end up slipping ads into the paids versions too.

Youtube has become this venus fly trap where content creators get exploited. They exist on the site solely to draw in viewers to show ads to. YouTube doesn't really care about the content or their creators(they don't care about paying them either since there's endless accounts) their primary function is to sell ads. That's it.

With data harvesting and personalized ads they basically print money for themselves. Now each ad spot will show something different to each person, meaning they are getting paid by multiple(potentially hundreds or thousands) of companies for each available ad location. They don't care if you buy the product because they got paid the second that ad popped up on your screen.

Ad based revenue is creating a huge fucking mess for everyone.