Apple can break Beeper without relying on the secure enclave: If Apple devices just send their serial number (IMEI for their GSM products), their servers can refuse to talk to hardware they didn't manufacture.
If it ever becomes popular, there will be a lot of duplicate serial numbers. That's easy to detect and ban.
> Apple can break Beeper without relying on the secure enclave: If Apple devices just send their serial number
You have come full circle with the comment 4 posts up.
(perhaps different sets of data can be used, but it must be something that Apple already has, and the user has already provided (i.e. the iMessage email or the iMessage phone number, from the iPhone's enabled Settings)
I spent a number of days with them where they were trying to work out if they were fake. The serial number was real but they were fairly sure the number had been taken from a real product and reused, but were unable to say for sure.
I ended up just returning them (because of the ebay return window) but found it interesting that Apple couldn't easily check this, and was very aware of the issue.