Do you search the IDEX exchange directly on Google?
Both the first and second places for Google search solutions are phishing links, though both eventually point to the real IDEX exchange.
It didn't happen to me, that is just a comment I found on another website.
I am aware of the phishing links; if that is the reason why these people lost their funds it wouldn't be as bad as if there is actually a private key sniffing issue as they mentioned.