@Inaginni,
I believe that Alyona hasn't need advocate. She is strong and smart enough to answer in her name, and Plarium's name.
Except your doubt, and imagination, you also didn't show answer. And that is expected and acceptable because you heard just rumors, don't know truth.
Your story about 80 M? Come on.
Plarium could make only one mistake with BG, and made it - you could become negative in bank. But how much negative? -70 M? No chance.
You could fill bank for longer time, preparing (yellowing) tasks. So in the best scenario you could yellowed all tasks, and put inside huge amount of troops. Your troops. Let say that level 55 is average with about 20 M resources each. If all tasks are yellowed that means that you have chance to get full payout of 100 M and 59 * 5 M from the rest. You already invested at least 105 M (mentioned huge amount). So in the ideal situation you can get about 300 M resources, or 13.6 K Dragons. 80 M? NO.
On the other side such exhibitionism will demand from you about 315 M resources to put back in BG before next full payout - or to translate, you will never get full payout again. If there was a bug somewhere in banking that could be fixed without changing anything in BG.
In last change there is one very ugly secret. You cant get next full payout when you expect. You should to get payout when your bank is filled. But because you have to put previous payout + tax get payout before you get new one. If this isn't true, and if you can get payout before you spend previous payout, then you are in old yellowing way.
BUT, on emptied bank (not possible, just to show problem) with all new tasks, very soon with full payouts you will yellow all tasks, because one full payout is enough to yellow 4 similar tasks. So we have about 15 full payouts and after that we will be in all yellowed tasks. What is changed?
Plarium took from us possibility of planning, and on that way many players will put whole armies in BG and they will not be able to get full payout, until some (secret) point, for them totally accidentally. Solution to get back troops will be long time building or short time buying.
Maybe, I'm wrong and missing something. I'll be happy if I'm wrong, for sure. This is just to stop story about 80 M.
If something was really wrong and Plarium solved that that they never will allow to same thing exist again (about your future), and there is no need for secret.
If ... very simple, public that and everyone will say thank you.
But if nothing was bug, then this change is very ugly suprise for players.
On one or another way, we, or at least me, will get answer.
P.S.: You still can have negative balance in BG, but that is terrible position for next task. And always was.