Well it does. There's no way a 15 buck subscription is paying anywhere remotely close to enough to compensate for all of the games the service has, per user. A world where game production costs remain the same as they are today, and where games are only or primarily distributed via services with these payouts and at this small of a cost to the enduser, is not a world that will ever exist.
Some could argue that we could all benefit from game development costs dropping significantly, and I'd kinda agree, but not all present day developers, AAA or otherwise, will live to see that day.
They don't generate revenue on Game Pass, because Game Pass isn't profitable. That term was only ever used by Phil during its very early days, and very quickly was sidelined for the word "sustainable", and then "sustainable long-term". That's very deliberate corporate speak, because of course misrepresenting a product and tricking investors into buying in would be very bad news.
You're right; the objective here is growth. The last time I dared to outline what I think they're doing with that strategy, I got banned for a day, so I'm not going to. But just like all major business decisions that are this sweeping from an industrial point of view -- the old "it sounds too good to be true" adage -- there's an underbelly that people are missing, deliberately or not.
And I really wish people were more ready and willing to have that discussion now rather than later.