The rate of increase is massive for Game Pass.
It went from 10M users to 18M users in 6 months. That's nearly a doubling in 1/2 a year.
Most things don't double annually, let alone 1/2 a year.
Most companies expect a 5% growth on their subscribers year over year. They're getting nearly 300% if they kept that rate if they are at 30M users today (which likely they have not, that's just way too ambitious).
I'm mentioning things like the stock market because, as you say, you have a company with a variety of incomes, interests and so forth. That alone are the same reasons why everyone isn't subscribed to the service.
Some people don't want variety and yet some people want variety
Some people want to play exactly and only 1 game
And some people want to play them all.
Some people have families that like all different things, and some people have families that aren't interested in gaming at all.
You can make game pass free and still not get infinite sign ups. Many F2P games out there, and I'm fairly positive you didn't sign up and play all of them and it's free.
You can't force someone to like something that they don't want or like.
Game Pass being of good value has nothing to do with whether or not someone wants it. They put the service out there and people that want it are signing up. And everyone else that doesn't want it can stick with the traditional method.
There's an implication here that the service is not successful because it hasn't monopolized the market. That's just an impossibility for any service and it's not in any way respective of real goals for a company. No company builds a product forecasting it to be the next sliced bread.
That's like saying AMC or GME are not impressive stocks (to watch) because they didn't hit $1000 in share price to short squeeze, but ignoring that they are both over 1000% in gains in under a year.
I doubt Game Pass will ever reach the 207+ million subscribers that Netflix sits at now, but who knows? /shrug.
