Sorry for the name misunderstanding... We use the word "marketplace", but not the term in CF.
The background is, firstly it is a public cloud, people use CF and the services provided by the CF; We built a framework (not like service broker) to help people contribute different service, then sell the services in it to the developers using Cloud Foundry. (The services can be used in CF, by the service broker we build; but it also in K8S and other PaaS. But mainly it is used in CF currently...)
So the problem is, when a new contribution, such as MySQL based on Brooklyn added to the marketplace, we need to register it to the CF.
I am not sure if it is clear enough, if you interested in it, I can share some introduction videos.