Nope. Apple gets their standard 30% cut of any business that happens on their products (which has its own antitrust case because it's nearly textbook monopoly rent seeking), and Google gets to simply pay a 30% cut to not really have to compete, which is also anticompetitive monopoly behavior.
I didn't originally think this case had legs, but the nonstop barrage of blatant evidence has me thinking the FTC might actually get a win here.
They don't even have to enable RCS like Google wants; they could release an iMessage app for Android.
They'd control the data from it, they could require an iCloud login, and they'd probably drag a decent chunk of Android users off Google Messages and WhatsApp. Hell, they could even keep non-iOS devices as green bubbles, but fix all of the security and filesize bullshit.
But they've evidently decided it's not as valuable as selling more iPhones by encouraging teen exclusion and bullying.