My questions:
1. From the beginning of the site launch up to whenever point, was there a team of beta testers?
No, There was no beta tester team. But, after this. Paradice be awarded and they do test before launching new programs.
2. If there were, do gero2021 part of this tester team?
We never had beta tester team. Still, we don't hire beta tester from outside of the team. We do test by our staff team. And gero2021 is not our staff.
3. Since the time of gero2021's manipulation and testnet is relatively close, is there any proof whether gero2021 played on testnet or mainnet?
As I already told you. We never had the testnet and beta tester team back then. But, we have a secured testnet now. But, only Paradise staff can access the test net. Yes, we have proof. But, we don't want to show it here for security reasons. If any moderators or LoyceV or Ratimov ask for it. I can provide it via PM.
Well, I am asking because if the scenario is a testnet, then
gero2021 is clearly cheating, as he breached the agreement between the test member and dev by manipulating the loophole instead of reporting it. But now, based on your answer which can't stress enough that
gero2021 is not a test member, and that he's playing on mainnet, it is became glaringly obvious that the case was like what
RaptarX and
aioc said. You had a bug in your system, which is completely your fault, and thanks to the cheater you found and patched it.
Did you owe him the rest of the fund? No, i don't think so.
Did he have to return the 2btc? IMO, no. It's his reward for finding a loophole and the consequence you have to pay for not screening your program thoroughly enough.
Did he deserve a type-2 flag? Again, IMO, no. A red trust maybe, but not a flag, as he didn't breach any contract. He's not a member of test program under contract, nor your TnC --as he stated-- specifies that betting negative is not allowed.