Adding new systems

I'm wondering why Roll20 doesn't have some of the newer systems on here: Star Trek by Mobius and Genesys by FFG, just to name a couple.  Does Roll20 need to purchase rights to list these games in their list or does the lack of dice support for them make them unattractive to devs?

The games dropdown menu exists to help standardize the options available (example: 4E vs. 4th Edition vs. D&D4, etc). No matter how many games are listed, some may not make the cut. Games are added to the list periodically. This ensures obscure listings gain greater visibility when sorted via the Other Games option and helps keep away “empty” search listings for underrepresented titles. If you feel a game should be listed, encourage your community members to play and post often. The more community attention a title receives the more likely it is to be added to the list, but the Suggestions forum is not a viable route for getting a game on the games dropdown menu. I'll be closing this thread and releasing the votes.