If you want groceries you have to pay. If you want YouTube videos you need to pay by playing the ad(legally speaking, obviously you can steal if you like). I don’t see any difference.

Where's the obligation to watch ads spelled out? The legal obligation to pay for groceries is spelled out in the law: they are the possession of the store, and if you want to acquire them you need to exchange something else of value (money) for them, at which point they become yours.

What is the thing that compels you to watch ads on a service like Youtube? There's nothing in the law; if there is anything, it would be spelled out in the Youtube terms of service: https://www.youtube.com/t/terms

Can you find it for me? I've looked. Many times. It isn't there.

Grocery stores offer free samples and if you walk in, take a free sample, and leave, you are violating no laws, you are not morally depraved, and the store does not consider that a problem.

This is true even when that free sample has "rules" like "not for adults" on a jar of cookies.

Grocery stores often purposely price things below cost to get you in the door. If you go to your local grocer, buy a hundred subsidized Turkeys and nothing else, you have again committed no crime or moral violation even though you have explicitly cost the company money and they wanted you to buy other things.

Terrestrial FM radio and TV broadcasts have existed for decades and both provide ample case law. You are just wrong, and Google knew that when they bought Youtube.

Google also regularly reduces the ad pay out to Creators and increases their own take. Google can fuck off.