Being a Unity tutorial maker in 2023 sounds like pain right now lol.
I do have to say the joker part is a bit silly, I've used Unity before as a hobbyist and Unity Engine is fine IMO, more than fine even compared to the alternatives. Every engine has problems, pick the right tool for the job.
Unity Technologies, the piece of shit company is the problem.
Maybe its a hot take but I think the exact opposite for YTers, I doubt any of them will switch, except for the generic "Unity Developer tries [insert engine here]" video and those already existed even before this mess.
Also these creators themselves would have to learn enough to become competent so they can then make content that isn't shit and unfortunately the YT is very punishing they can't afford to drop 3-6 months just to learn a new engine and then make videos again.
Small devs yeah some will switch I agree. But it depends what you mean by "successful". For some it just means "profitable" and I doubt these ones in particular can afford to switch honestly. They have very material concerns, if they're not going to meet the quota then it doesn't make economic sense to waste 6 months or even years on a project to switch.
The real successful ones yes they can afford it so good for them imo.
i think Unity will eventually relent and go back to old pricing model (but taking a larger chunk).
The losses are insane: https://twitter.com/incontinentcell/status/1702740599793733904