I think you’re confusing the advantages and strategies of having a subscription and the advantages and strategies of having a loss leader.
Not all subscriptions are designed to be loss leaders, and most of the benefits you see in GamePass (lower or even negative revenue in exchange for increased market share) is seen over and over with loss leaders that aren’t subscriptions.
Yes, I agree that Microsoft has adjusted strategy from a focus on winning console wars to increasing software gatekeeping across PC and now apparently even competitor consoles. And that GamePass plays a large part in that.
But it would be a mistake to assume that subscriptions in games are all going to have the same goals and focus as Microsoft with GamePass.