TThere are some platforms that have some past criminal record. This don't seem to be good as it would affect to their reputation and a good reputation is what ensures the success of a company on the blockchain network. This is proven by the fact that some companies have nice features to offer but might have had some bad reputations earlier. This would make them have a low trading volume and lesser traders actively using their website.
An example of such an exchange platform is known as CEO Global. It is an Asian exchange platform that had a problem with its reputation. In its own case, one of its founders was accused of some crimes and was held by the Chinese government. This made people loose trust in the exchange platform and the platform gradually lost traders. Presently, it no longer functions.