At this point, I believe it's negligence from the exchange because people have been making these complaints for a while, and they've done nothing about it. They have not paid any interest to the complaints. I believe if they start banning accounts of culprits as example the rest will take note and stop.
There's nothings others can do aside reporting the accounts that do that, but if after reporting and the exchange doesn't do anything about it, the best advice is to look for another exchange.