Not legally. That’s the entire point here: you can use YouTube’s content without following your part of the deal but you don’t have any right to complain when they start blocking that. Nobody is saying you have to like them, only that you don’t have a right to use private property without the consent of the owner.
That’s the same point: artists put stuff out where you can see it on the expectation that they’ll get paid. If you don’t want to keep your side of that bargain, you don’t have much standing to complain about being blocked.
The artists sign a contract with youtube. Non subscribed users don't. The same way promises only apply to those who believe in them, terms of services only applies to people signing a contract for them.
If a physical shop decide their terms only allow the customers with a membership card to look at the window from outside but decide to not put curtains, those terms do not apply to bystanders who could see inside. Same when my neighbour is naked with all the lights on. If she doesn't want me to see her, she knows what to do.
It's like a bookstore that allows anybody to walk in from the street, browse the shelves and read books on a couch, but then says that you're only allowed to do any of this if you also make a purchase or politely listen to one of their employees give me a sales pitch. Well unless they get the cops to arrest me for trespassing, I don't care about their rule. I'll browse their books, read a few, and walk out without buying anything if I please.
If they don't like this, they can turn me away at the door. But they don't, they let me and I'm not signing any contracts with them, so fuck their rule.
The terms of service still apply. If you choose not to follow them, don’t complain when they stop allowing you access. Nobody _needs_ to access YouTube so there’s no harm in not having access to their service.
Nobody signs any terms of service except the subscribers of a membership accounts. Nobody is bound to terms listed in a small link hidden somewhere in the page.
Besides, I checked the terms of service in this page[1] today and nowhere is it written that people are forced to look at the ads and can't turn away. And rightfully so it would be illegal to have such terms in most juridictions. So even those that are aware of those terms because they actually looked for them ought to see the ads.
