Good to see we have some bigtime Youtubers commenting and stating how adpocalyse has affected them. From years of running a fledgling Ebay business due to bad health, I can tell you that anytime you have to rely solely on one third party entity to make a living, you're heading for trouble.
Ebay have changed their policies to suit their own business model so many times... Now Youtube are doing the same. The best strategy is to hedge your bets and use several platforms to make a living whatever that may be.