Probably nothing. I haven’t heard of other apps being blocked. But Beeper has been running for like a couple of years now (but recently changed to a freemium model, before it was subscription only and had some people had been on the waiting list for a year+, they said they are aiming to get down to no wait in the next 3 months, and that was probably a month or two ago).
If you think it’s at risk of being blocked, that doesn’t mean you can’t make hay while the sun is shining 🙂