BitMEX published a blog post authored by its Co-founder and CEO, Arthur Hayes, stating that the exchange experienced two DDoS (denial-of-service) attacks on the day the market went plummeting, with bitcoin diving to the USD 5,000 level, briefly touching the USD 4,000 level, and even moving below USD 4,000 on BitMEX. With a DDoS attack, the hacker floods a website from many different sources in order to disrupt the service and make it unavailable. This is what the exchange says happened, as the attacks delayed or even prevented requests going to and from the platform.
Perhaps this message is one of the best advertising options for the service. The exchange was able to withstand DDoS attacks and maintain customer confidence. This is big respect!