You can choose a different game engine or write your own. You can not write an app for iOS without Apple SDK
Disney could allows 3rd party cafes in Disneyland, mandate the use of Disney logos on all products, and charge a $2 royalty of every product sold with a Disney logo.
It's a dick move but shifts the legal argument from one of monopoly / gatekeeper status to one of intellectual property rights, the latter being much more business friendly and entrenched in international agreements.