If you never heard of GaaS maybe you should invest some time to learn. Game as a Service, or GaaS, is the latest craze on mobile and they are all hurrying to learn what it takes.
Some games implemented GaaS and made a mediocre launch a huge success. Like Rainbow Six Siege, which meanwhile is called the best tactical team shooter of the planet having over 30m players. OR GTA V, which, despite its age, is closing on selling 100m.
Maybe you don't know the fun part of GaaS. The lessons you need were defined over 20 years ago, by a game called Ultima Online. And the developers spread the knowledge of their experience on GDC. Just check Raph Kosters talks and articles here.
So sometimes I feel walking in the past when advising clients on what GaaS means to their development and company.