It's moneeeyy. That's all there is to it, money. They finally have an easy way to control what you can or can't do with the things that (at least on paper) you own.

I just knew this was gonna happen... I warned about these things ever since music/movie subscriptions became a thing. You don't own a copy of what you (allegidly) bought, thus, it's not yours.

Now, you do own the thing... at least on paper, but you can't do much with it unless you pay extra cash to the one who sold it to you, so it can... you know, do the things it's supposed to do. It's basically extortion, no matter how you slice it. It's malware, period.