As usual, Gruber was right on the money. Via Threads yesterday: "My prediction is that Apple will make changes—fixing bugs and/or closing loopholes—that break Beeper Mini. It’s untenable that there’s unsanctioned client software for a messaging platform for which privacy and security are a primary feature. It’s a very nice app, remarkably clever, and for now works like a charm, but if Apple wanted an iMessage client…
If an "unsanctioned" client can compromise iMessage security, then there was no actual security other than obscurity.
Imagine there is a theme park that has normal ticket booths and some requirements there to get in. Then there comes a Beeper that finds a hole in the fence on the perimeter and sets up their ticket booths there. It's in theme park's best interest to close that hole and cut off the revenue stream of somebody pigging back on their theme park.