I agree with you at some point, there was a bug exploit a mass one? yes but this wasnt an obvious bug because of how the sacrifice works, the sacrifice is totally random as you might know already, i did a lvl 4 sacrifice and got a few 3 star evolution shards like 2 or 3 of them once but i did a lvl 2 and got 4 rare souls and 4 rare sentinel souls so they abused of the bug? yes but without knowing it since it wasnt obvious, they never saw the rewards and said "oh the sacrifice is glitched lets explit it" they were like "how lucky" so the correct way to deal with this might be a rollback or account adjust nothing more nothing less