The channels at risk (or at least the content/producer) that get their only source of income from the ad revenue and have rode the 'gravy train' of steadily increasing revenues and per-view monetization to satisfy their craving for goodies/bits/items until now.
Even apart from the major goof-up on Google's part with putting ads on very questionable content, there's always the risk that the price paid for advertising space gets lowered. That's what's basically happening now. A lot of advertisers have pulled back so there's now a large amount of available 'slots' for the remaining ones to buy into so prices go down.
To sustain their 'habit' some content creators are now suddenly looking towards paid subscriptions. Seems like a bit of a hack to me, but it may work if their fan base is loyal/crazy/persistent (choose your option
To me it still seems like it would be better to have diversified in the past and gotten multiple cashflows getting in so if one gets lower then the impact is much less. A channel like AvE (and others) have been using Patreon for some time already and that has given them a different source of income to start with.
I may be wrong, but I don't see Jody as a person who puts all his eggs in 1 basket, so I suspect he may not like the reduction in ad revenues (it's not fun for a content creator), but that he has enough other cashflows to not have to go to 'panic' actions like others.