Hold on there. Ads popping up on YT are annoying but it's up to the user to decide if they are worth the content they're watching, same as TV or print or the radio. Using an Ad blocker in my view is no different than stealing.
Toss in SponsorBlock to auto skip time wasters and Unhook to hide the manipulative recommendation feed and other noise, too! Life is too short to waste it on advertisements.
Not using a piece of a service (the ads) is not stealing, nor likely is it violating any service contact.
Nope. Website sends information to my computer, my computer displays it the way I want it to be displayed. The website sending the information doesn't own my computer.