I’ll believe it when I see it. I’m pretty sure during the Anthem fiasco it leaked that EA doesn’t prevent studios from using other engines, but strongly incentivizes teams to use Frostbite. For instance by taking the licensing fee out of the development budget meaning you either cut down the scope or use an engine that might not be suited for the project.
It’s very EA to say “you can use whatever you want” and then leave out the “but we’re not going to help you if you don’t do as we want”.