"Ads is the sole source of revenue" is plainly wrong, unless You're maybe just beginning. Looking at some breakdowns (strangely, quite a few channels publish them) the ad revenue seems to be just a minor slice these days.

The actual income is either from sponsorship, Patreon, merch, or just plain "advertising yourself" (seemingly the case of many photo/videography channels).

It's not too much of a stretch to say YouTube ads are detrimental to any of these revenues.