No Quota separation of "Members" and "Artists"
In Jamroom 4 there were 2 different types of users - "Members" and "Artists". Members had access to a subset of the features that Artists had, and while the number of Member accounts was unlimited, you were restricted to a specific number of Artists Accounts (based on the Jamroom 4 license you purchased).
With Jamroom 5 the artificial limitation between Members and Artists has been removed - there are now only "Profiles", and they are always unlimited, as the Jamroom Core is free
Since you have full control over the features that are part of any Profile Quota, it is easy to emulate the Jamroom 4 Quota setup in Jamroom 5 simply by defining the feature set you want to make available to each quota.