Firstly I see no reason why someone on this forum that has ranked enough to be in a signature campaign would receive bitcoins directly to their exchange address and worse of it all a centralized exchange. With all the endless threads and discussion about privacy and decentralization I think it's high time many were already properly informed about these things.
I can see the reason behind the use of a centralized exchange address, and that is to save both fee and time when converting their Bitcoin to fiat currency. Although using a centrlized exchange address in the signature campaign is not wise, it is not forbidden. Besides, one can't push their belief on someone else, especially when the user truly trusts the exchange.
There are alot of things to be learnt from discussions here and the least and most of recurring of them all is the gist concerning privacy and decentralization.
Yeah, I think the two participants will have a hard time explaining their case on the centralized exchange. I hope they can fix their withdrawal suspension soon.