I did not want to talk about the case but I will ... recently the gaea added the duel mode, but there are people who are using secondary accounts to bet on a loser (combined) and the main account in the supposed winner ... and this to pass your gems to the main account, but it's easy to get gems by creating multiple accounts and putting them at level 100 ...

bug googleplay: I think you should already know this because it works since 2015, that's when you buy gems, (it only works in the hoc) (I think) regardless of the value, if you ask for a refund from googleplay you get the money back but the gems stay in the account and can do this up to 10 times.