> Unreal has licenses which allow you to use one version of their engine FOREVER and they cannot revoke that license. So the author didn't fully research this. It is true that for NEWER version Epic can change this.
If I understand correctly, Unity had that too. And then they changed it anyway.
I don't know the details, but apparently Unity maintained their license in a git repository for the explicit purpose that everybody could easily track changes to their license. Just before the license changes, they removed that repository, and later put it up again, but without the clause that you could always use an old version forever without new restrictions applying to you.
If I understand correctly, Unity had that too. And then they changed it anyway.
I don't know the details, but apparently Unity maintained their license in a git repository for the explicit purpose that everybody could easily track changes to their license. Just before the license changes, they removed that repository, and later put it up again, but without the clause that you could always use an old version forever without new restrictions applying to you.