Sure but he also monetizes videos rather than turn it off, let's say every browser by default blocks adverts and skips sponsored segments is he still going to support it?
The argument that a behavior is acceptable because only a small amount of people do it is a bad argument, if he doesn't like adverts he has the actual option to turn them off and not to accept sponsorship. His income comes from the fact most people watch the adverts so he supports and agrees with the advertising model.
Sure you can argue it's not worth the effort to stop 5% of users freebooting but when is it worth the effort? If creators can't afford to create because there's no money in it then the platform dies, so where is the line?