Even “games as a service” aren’t very service forward. No real reason they couldn’t be hosted locally for the game part other than the developer does not give the user access to the server software to host your own games. The actual “service” is having a store with constant, small content additions, and not being able to play in servers outside the developer/publisher’s control. MMO’s fall into this category, too. Plenty of defunct ones that have been revived through user created server emulation show even a regular player could technically host these games and still play them without the need for using the developer’s servers.