The devs have contracts within the XCZ project or for clients of XCZ?
they have a contract with an investor with whom the information is not known, and accordingly, they must create a platform under this contract.
As far as I have read in Telegram and KeyBase (the most active Social Media platforms the group has), the contracts you are reffering to here, are contracts with paying clients that make use of the service of XChainz (which is providing a platform for assesments and trainings and using XCZ as a rewarding coin for trainers (paid for trainingen) and students (finished a course they did)). For instance, momentarily the Madison Square Garden in NY has a paying contract with XChainz to make use for their services (and I believe that is a contract for at least 3 years).
With these revenue of the contracts (monthly payments) the devs / ceo's have paid for server costs and listing fee.
And there are ongoing talks with other possible paying clients (usecases) like this. So the revenue from the contracts are used for the listings (amongst others).
And the ceos are working on more paying clients for (users of) the XCZ platform.