Shannon Liao has an idea on what Apple Arcade could foretell:

Five dollars a month might seem cheap, but depending on adoption rates, it could be incredibly lucrative for Apple. An estimated 50 million people could subscribe to Arcade within the next two years… At $4.99 per person, that’s $250 million for Apple each month

How about a package of apps for a monthly price tag? Apps as a service? AAAS?