FYI:
Question for the community, at what time frame should we place them on the Do not Trade List like yobit , if they are not allowing deposits or withdrawals to their zeit wallet.
Time frame choices.
1 month of being offline
3 months of being offline
6 months of being offline
Wanted to see the community's feedback on the above question.
1 month for me is probably too short if there was a real problem on one exchange, like Cryptorush back in the early history of ZETCOIN for the elder ones, it took more than 1 month to spot the real issue, neverending discussion before acting

6 months far too long, would be nefast for the coin, sending a weak signal to the crypto-community.
So , IMHO , 3 months seems to be a good compromise to add exchange in the "Do not Trade List", after several warnings of course !