I did not agree to anything. When I open the site they just start serving videos to me (even autoplay is activated by default). If they don't want me to watch their videos without ads they should stop serving them to me (ie, put them behind a paywall)

Ownership implies a device should be controlled by the user. I don't just mean not playing adverts but how about not recording my voice (or other data) to send it to Google servers for them to keep and exploit? You're free to believe in this implied agreement but I doubt that's in your best interests.