Just to confirm: does Unreal have any similar clause? Do they look like they might go that way too? (e.g. do they have "authorized" cloud partners)
https://twitter.com/TimSweeneyEpic/status/108340746025221734...
Not only that but he points out that they intentionally made Unreal Engine's TOS "perpetual" specifically so they can't change it to do something like Unity has done here.
On top of that, Unreal Engine sourcecode is available to all Engine users on Github unlike Unity.