Unity's blog post refutes a lot of what Improbable claim about released and in production games:
https://blogs.unity3d.com/2019/01/10/our-response-to-improba...
https://blogs.unity3d.com/2019/01/10/our-response-to-improba...
Why would Improbable continue to support Unity long term when it's a dead end for them?
Unity has just done something actively hostile to their users, and they're attempting to downplay it, poorly.
It's Improbable who acted badly here.
Unity is trying to tell me, as a game developer using their product, where and how I can use the built executables generated from their editor.
I have no interest in Improbable and this has been a major shot across the bow for me.
Were this limited to Improbable, and the changes limited to what is required to stop them (no building of executables for third parties using the Unity Editor), nobody would care much.
If you're not just trying to troll, I would suggest actually reading the wording of the changes.