AdBlock is a great thing.
Those who deny it are too naive and think that being a youtuber is a real job.
People make a living based on not only the monetization of their YouTube videos, but the merchandise, and other crap they sell. Businesses bring in new customers with advertising, massive amounts of websites probably pay for their existence with advertising, advertising can alert the consumer to a better deal or to a product they didn't know existed.
Blocking out advertising is naive.