ah interesting, so Beeper's days may be numbered by when Apple drops support for older devices. But if they can grow quick enough then they'll have enough users that Apple can't quietly nail them and stuff their body into a dumpster.
Perhaps. They didn't start including the SE with Macs until the first TouchBar Mac in 2016. So there are many millions of non-SE devices in use right now. Of course, Apple could still decide to unilaterally drop support for iMessage on older devices, but doing that risks pissing off and probably losing for life tens of millions of users to prevent, let's be realistic, several hundred thousand users (this is a paid app, this isn't free) from using iMessage on Android using this method.
I wouldn't put it past Apple and other reverse-engineering routes might have to be taken but I don't think this is as easy of a "Apple will instantly shut this down" scenario as many others seem to.
If it realistically stayed with just several hundred thousand users, I would agree.
My suspicion though is that there will now be a rush of apps doing imessage on android or windows etc, and probably also spam on iMessage will go up which might stoke the fire a bit.