I already told you, that if technical details were posted before delisting it could help to fix the problems and direct sigt community energy to the correct target.
Why they get banned from there is they raged out there and talking shit !
Do you know that 10-20% of people around are crazy? You can google for statistics. The internet full of trolls, and what was your reaction if bank frozen your account for a month? I'm sure that Poloniex support was flooded, when they frozen ZEC wallet. And also another 10% of people have a lot of BTC and they wish to spend them on your exchange. You just punished all those peoples. So sigt 50 btc\day volume moved to another exchange. Good job!
It appears Cryptopia was informing Signatum what was going on. A dev from Signatum even visited Cryptopia personally and confirmed the problem with the Signatum wallet. Next thing it wasn't just the 10-20% that continued ragging, the
lead dev of Signatum incited violence against Cryptopia and Signatum publicly bashed them on twitter. You should not be at all surprised that this led to delisting.
As for Poloniex support getting flooded, has anyone received a response to a support ticket there in the last two months? I know I haven't.