Here's my theory. I don't know if you have seen a Black Mirror episode, "Smithereens", but what's happening here with Betnomi might be similar to the events in that episode, namely: you create a big and very profitable business, make a lot of money, and decide to take a rest in some remote place with no mobile or internet for 2-3 months. Unprofessional? Very much so. But humanly it can be understood. It may be a lifetime opportunity to spend couple of months like that. You are making big money, but you've noticed that you can't rest peacefully, you are always getting phone calls and messages needing your attention, even on holidays. So, one day ypu decide, I have to do it at least once in my life. You put everything on auto-pilot, take your family and friends, and disappear for a summer.
I have to say, I am not a businessman. I'm just a regular guy trying to understand this world.

Lmao. This is one crazy theory. I have never seen that TV show, but I heard about it and my interest in it has risen thanks to your example. Anyway, I don't think the same happened with Betnomi.
Why would some of their employees delete telegram messages if that were the case? They just bolted plain and simple.