This will absolutely kill any incentive for the remaining indie devs to use Unity with such a low floor and flat cost. Whereas your game going temporarily viral would have been huge , now it’ll be a huge burden. Meanwhile Unreal is 5% after 1M.
A progressive fee would have at least made some sense.
As it is, Unity lags severely behind Unreal for both features and sentiment. The big markets for Unity were indie and enterprise. They’d ceded everything in the middle to Unreal.
Epic provide megagrant funding to Godot, in what I imagine is a play to eat Unity from the bottom up. Unity will just accelerate that.
And enterprise is fickle. They’ll switch to something else as soon as any project lead feels like it.
Imho this is one more step down the road to the death of Unity. They have brilliant engineers led by very incompetent leadership.