Those people and studios are currently still able to release games written with the Unreal Engine and will continue to be able to do so regardless of the outcom

Those people and studios are currently still able to release games written with the Unreal Engine and will continue to be able to do so regardless of the outcome of this situation unless Epic decides that they want to continue violating the guidelines of the platform. In the future, every dev on Unreal Engine can still compile their game and put it on the App Store without needing Epic at all.