What is GMX spam?

Excuse me, could you please clarify what exactly is meant by 'GMX spam'? I've heard this term used in the context of cryptocurrency and finance, but I'm not entirely sure what it refers to. Is it a type of unsolicited or unwanted messaging related to GMX, a particular cryptocurrency exchange or platform? Or does it have a more specific meaning within the industry? I'd appreciate any insight you could provide on this topic.