This is dumb. For two reasons:
- the fact that a messenging service locks users into an ecosystem.
- the fact that to use this an apple device is still used in the background. This means you log in with your apple id on a device that does not belong to you and that can possibly read all of your messages.
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.