Couldn't these people just make patreons instead? Quite a few of these people who've bashed this new policy, like YourMovieSucks, has a patreon, so what are they complaining about?
I don't have a single fact to back this up, but..
A lot of the bigger channels affected by this either don't have a very loyal viewership, especially all those shitty drama channels that became popular a year or so ago, or their viewership consists of children who couldn't donate to them even if they cared. It might seem like they have a lot of dedicated fans because of all the fan art and such, but the bitter truth about fan artists is that 9 times out of 10, they do it for exposure.
On the other hand, people like YMS or RLM who run successful Patreons have pretty loyal viewers. They carved out an identity for themselves before making videos was even profitable instead of hopping on a bandwagon and now that those bandwagons have hit a dead end, they're the ones who'll make it out alive.
That is mostly because they have been active for a while now and put a lot of effort into their videos. If you only look at the numbers, effort seems to be a waste on Youtube - why spend days or weeks on a video if an episode of a shitty Minecraft LP takes only an hour to make and rakes in 100 times the views?
However, that was only profitable under the old ad system. To get someone to donate to your Patreon, you have to make something they can't get elsewhere and would miss if it's gone. If RLM suddenly vanished, a lot of unique content would vanish with them, so their fans are more invested. If Pyrocynical vanished, the quantity of drama videos would decrease and that's it. Nobody would care for more than 5 minutes before moving on to the next fad.
People who don't strictly create anything unique are 100% replacable and that is reflected in the number of people willing to directly support them. This is a time for people like Ross Scott to feel vindicated - sure, he only makes pocket change compared to what literal children used to make from ad revenue, but his income is also more stable since the people who watch his videos actually watch them because of him, not because of the hot drama he's peddling this week.