Dont see how they could. The servers are real apple devices. Apple has no way to know if this is a mac from a real user or somebody proposing a message bridging service to non apple users. Dont see why they’d care either as they make money from the purchased server infrastructure.
Apple will just block it once they catch on
This has been around for a few years now as Blhebubble, and they haven’t blocked it.
There’s a couple other bridge services out there too, and those haven’t been blocked… Yet.
Dont see how they could. The servers are real apple devices. Apple has no way to know if this is a mac from a real user or somebody proposing a message bridging service to non apple users. Dont see why they’d care either as they make money from the purchased server infrastructure.