[Macha]

"Unity decides to change the deal in a way that costs us money for our already developed game" was not something on anyone's threat model. Until last year, Unity's TOS even included provisions that would have unambiguously prevented such a move. Maybe some considered "Unity changes the deal in the future and we need to learn a new engine for project n+1 and get stuck on an old version of Unity on our current project" as a threat. But now that Unity has put the first one in people's minds, Unity has to put people at ease about that to get to square one, not just cancel the current attempt.