Yes, point 1 is the model they should have adopted in the first place. The whole problem with their original announcement was that it was a) retroactive, b) structured in a way that would significantly hurt f2p and indie games, and c) based on installs rather than sales, meaning you could get charged multiple times for the same sale. If Unity had come out and said (starting with Unity 2024, we will be switching to a revenue sharing model", a lot of people might have still been upset, but it would have not caused nearly the same shitstorm and they would have had a better path towards sustainability.

Point 3 is absolutely real, because when you own your company, you no longer have legal obligations to public stockholders. Companies turn to shit all the time when they go public, because the pressure for immediate quarterly returns outweighs the pressure to maintain long-term sustainability. I think it’s exactly why platforms like Steam have avoided enshittifying, because their owners know they can make more money long term by building a sustainable platform that people like rather than burning their users to make a quick buck and juice their next quarterly report.