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We can only assume this was all a negotiation tactic, where they start with an unreasonable position, and force devs to accept an imbalanced (but manageable) fee structure they would have rejected.
I say that, but I also assumed that is what Reddit was doing, but they went full steam towards stupid town, so ymmv.
Reddit just wanted to kill third party apps to serve more of their own ads, since third party apps could natively include an adblocker.
Unity benefits massively from the fact that it's the default choice for indie game development. Even if they keep the majority of their devs, if they drive enough away to lose that default status then they're fucked.
"were seriously wondering if we can trust unity moving forward"
You can't. If you have to wonder you can't. Unity cooked their goose and showed that they are not your friends and will take every opportunity to fuck you over.