We will see - this is exactly Facebooks strategy with Instagram right now: Arguing that they have invested so much effort to integrate it with Facebook services

We will see - this is exactly Facebooks strategy with Instagram right now: Arguing that they have invested so much effort to integrate it with Facebook services (which they were prohibited from) that it would be far too expensive to force them to change it back. I hope the regulators throw that in their face and order it anyway, but the jury is still out.