I feel like this is looking at it from the wrong perspective... Looking at it like that, it is just trying to use a service in a way that it isn't intended. Don't get me wrong, I'm super anti-subscription and anti-gamepass, but I don't feel like much of MS Gamepass is trying to sell you on having these games forever. It's a way to let you try a library of games that you might not have felt was worth paying for individually -- I have almost no interest in playing the next Battlefield games, but with Gamepass I can try out Jedi Survivor alongside however many other games I want to check out.

It's a more straightforward Playstation Plus, with much less of that vibe of trying to get you to keep paying on a fear of missing out on "free" games that you're paying monthly to own. Both of these digital storefronts are selling you the exact same premise, but promote them in different ways. PSN says hey, you get 2 games a month for paying for online services, and they stack. (I think now it's actually a PSN library, similar to MS though?). MS says hey, you get 40+ games a month for paying for our subscription, and you get a discount if you want to buy one.

If I actually like one of the games, the cost of the subscription is removed from the total price of the game, effectively meaning if there are 2 games you like enough to buy, the subscription is somewhat worth it if you don't mind having it tied to Microsoft.

Basically, Gamepass isn't supposed to replace your main game library, it's a digital game rental service. Yes, you absolutely can rent out a single game, or even 30 games, for the next 10 years. And everyone would judge you for making that poor decision to rent them for that long, when you could have bought it with the discount. Should companies be able to offer something that the consumer can ignore and get screwed over by? I'm not sure. Probably not. But I also don't think I can really call this scummy, unlike some of their other moves. If in 10 years someone's library only consists of games played through Gamepass, and they are afraid to unsubscribe... How many games would that realistically be? The Gamepass library isn't that large, nor has it rotated that many games.

Again, very anti-subscription and overall anti-Gamepass, but I think in this example it's kind of on the person if they choose to rent a game for the next 10 years. If you like the game, why not buy it? Why would this person be locked into paying for Gamepass for so long? Because their account has other games they may or may not decide to play at any given time? I personally just don't see the issue for this particular case, unless I'm missing something or not understanding where you're coming from with it.