So stealing is defined (in some states) as taking property with the intent to permanently deprive the owner of the property. So you're incorrect and [email protected] might be breaking YouTube's terms and condition not the law, and it's not theft.
If Google were paying the content creators anything even remotely resembling the kind of income from advertisers the content earns, I might have a shred of sympathy for them losing a tiny bit of advertising revenue if some user watches a video without watching the same three ads they've seen ten times already that day.
You're spending a lot of time and effort defending one of the richest corporations in the world. It's weird.
I'm guessing you feel like a bit of a mug for paying your hard earned money to faceless mega wealthy corporation so you want to believe that people who skip the ads without needlessly paying Google are stealing.