I'm actually surprised MS doesn't just lock the newest games from the Game pass trials. I don't remember how long they removed the $1 around the Starfield launch, but say the releases less than 30 days old.
That would be a horrible experience: You sign up (even if it's just for a dollar) and then you would have to wait a month until you can play the new stuff. This way they are still giving away the single player campaign and one month of multiplayer for a fraction of the original price. If you want to buy the game it might even be cheaper to sign up and buy it with the included discount and then cancel again.
Well, I wasn't aware that they're doing this, because I don't follow Microsoft news.
Now that I've heard it, I don't find it particularly surprising, although as the other person suggested, surely there's a more proper solution.
Maybe they don't want a proper solution, though, because it puts them into the news...