Assuming they never have increased a price in 15 years, that doesn't prevent them from doing so, but it's a confidence inspiring track record.
I have about as much confidence that AWS won't raise prices on existing services/features as I do that Google will eventually kill another good project - https://killedbygoogle.com/
I'd also point out there's no substance behind your "game theoretic" jargon.
Of course AWS needs to make money.
Of course they make more money in the short term if they raise prices.
Of course this affects their long term revenue and profitability because customers are afraid that prices of any of the products they use could rise.
Say whatever you want about Amazon, but they have never been a company that cares about the short term. They care about profits for the next 20 years, not Q3 2022.
You’re calling me/my views naive? Seriously? Just after I excoriated someone for name calling?