TOS is like me putting a sign up at the end of my driveway saying if you approach my home, you owe me $10. If you pull up to my house, I demand the $10, and you don't pay me, I cannot forcibly take $10 from you, nor can I call the cops or sue over the $10.
You never agreed to anything and certainly not in any legally binding format.
Notices are not contracts and TOS notices are notices.
I never made that agreement. And if some software on my computer somehow gets YouTube to deliver me the content anyway, that's not my fault. In my view, it's a cat and mouse game, they can do whatever they want to try to stop me, and vice versa. If they win, I won't complain; but if I do, so be it.
I've held the position that, if YT wants to, they can block me from their platform for using an adblocker, and I would have no moral ground to stand on.
However, that isn't what they do. They try to circumvent it. They try to make it technically impossible. They try to mislead users into thinking their extensions are malicious.