And what's wrong with anouncing next release he is testing probably now?
Nah .. if everything is so straight-forward and clear in this world, there wouldn't be conspiracies, scams, etc right?
Just imagine .. having the cake and eating it at the same time: charges ppl for weak miner while mine for himself using the fastest miner. not to mention regular updates keep ppl interested and generate more ppl for his revenue. At some point in time, the dev fee is going to exceed those he gained from his own mining. but overall, win-win.
that's clearly the only reason to wait for 10.5 diff to release them. It just means it wasn't profitable for them to mine on their own.
(or at least to primegpu... but since primegpu was kind of greedy. he showed to others they could also make a lot releasing their own miners)
All this is really bad for the coin itself (but who cares actually) as it will certainly be the reason why it will never get the success bitcoin has.
(full acceptance of a 10% fee coins will hopefully never happened... for that matter any fiat currency "driven by corrupt bankers" (lol) is still better)