Some exchange platforms are actually dead but don't want to admit that. It's just like a Boxer that has already been defeated but still wants to fight more. Such a person would just make his or her trials in vain and might still end up being beaten even more. The same thing applies to the crypto world where an exchange platform would be gone but refuses to accept that.
An example of such an exchange platform is the Hubi exchange platform. Hubi is a Hong Kong based an operated exchange platform that I got to know over the course of exploring the Revain site. I tried accessing their website immediately and was faced with an Error message. I tried the second time, and the next, and the next until I came to a conclusion that the exchange platform is dead, it's just that its website still remains.