Ok let's go with actual numbers. We know how much Microsoft makes on Game Pass via FTC documents. It's approx. $230 million a month. That's $2.7 billion a year.
Xbox Game Pass made $230 million revenue in one month, most users pay for full subscriptions
Microsoft reveals a rare look at concrete Xbox Game Pass earnings, with the subscription breaking $230 million in subscriber revenues in a month's time.
www.tweaktown.com
We also know that they spend at least $1 billion a year on 3rd party content.
Halo 5 in a week generated $400 million in revenue.
Halo 5 Reaches $400 Million in Sales to Become Biggest Halo Launch Ever
The Halo franchise has now generated more than $5 billion.
www.gamespot.com
They're leaving money on the table to do this. They're trading the revenue that would be generated in sales for less revenue that is more predictable on a subscription service.
Microsoft mask almost all it's gaming numbers for the most part which is weird for a public traded company. In an interview an executive will say something is sustainable or maybe even suggest it's profitable but on legal documents the SEC regulates you will not get any words like that from this company. In fact they will say next to nothing.
One thing I know about publicly traded companies is when they're in profitable lucrative businesses that sort of stuff gets shouted from the hilltops. There wouldn't be all this obfuscation of numbers.