Sometimes companies use code names to create intrigue or protect their ideas until the moment of public announcement. In this case, "Nexus Market" https://link-nexus.net/ can only be a working name, which, after the completion of the development stage, will change to the official one.

Protecting confidentiality.
If the project or product is at the stage of confidentiality or in the process of negotiations, internal names help to limit access to information and avoid competitors' interest.

It is important to consider that without confirmed data it is difficult to determine the exact nature of the "Nexus Market". If this is an internal or code name, it is unlikely to be displayed in public sources, and its essence will be known only to employees of the company or selected project participants.