That's a lazy rationalization which doesn't even make sense — either way you're getting the exact same sandwich, it's just a question of whether you pay for it directly or by watching ads.

This also doesn't make any sense from the negative way you're describing it: you're eating at Cockroach Joe's every day so clearly you don't really believe the food is bad. If you're using YouTube now, any negative which you can possibly imagine is already happening: they're tracking what you watch and where you watch it from, they're telling advertisers what kind of devices you use as a proxy for your likely spending habits, etc. There's a 0% chance they do that less when it's their only option to make money to cover your usage costs!