Literally this. Nintendo/Pokemon Company could find about this any moment and shut it down. So despite crashes, lets just enjoy the game while it lasts. Because the reality is, this game is already living on borrowed time. It's an awesome game, its a beta so bugs and instability should be EXPECTED by this point by anyone calling themself a "gamer".
Complaining and badmouthing the dev will NOT motivate them to work faster. Nothing gets done faster when you complain. If anything it demotivates game developers. So way to be counter-productive guys. If you want to give feedback and constructive criticism, please do. But this whining...isn't going to get you anything.
As for the $$$. No one is forcing you pay. That is a choice YOU make. And it is a DONATION, which means you do not get any entitlement or special treatment from it. So if that's the expectation, then you're just going to be constantly disappointed.