In the blockchain industry, it is no longer a new thing to see a company not bei g functional again. This has happened alot of times that seeing it happen again is no longer surprising.
An exchange platform that I've had an experience with and have passed through the same thing is TopBTC exchange platform. This exchange platform seems to have started well according to the reviews I read about them (I had to read reviews about then because I never knew much about the exchange platform when it was still in existence). All of a sudden the exchange platform went down and there have even been some comments from traders of losing funds due to the unannounced stop if their service.
As of the last time I checked their platform with an intention of trying to trade and see how their service is, I wasn't allowed as the platform is completely down and not operational any longer.
ο»Ώ