Why rent when you can own? Why be a slave when you can be free?
In order to provide them with a steady source of income, corporations would love to brainwash us into believing that games are a service for which they can make us pay over and over again, until the end of time. Renting games is a step towards this.
I understand a lot of the points against rentals. People like owning things. They like to replay. They feel like they're helping the developers more directly. All valid points, and while I don't find important enough to push me to buy instead of rent, I can appreciate them.
You, though, are being ridiculous. I can quit Gamefly any time I want. They provide a service that saves me hundreds of dollars a year and makes it so I don't have my house cluttered with games. Now, if developers only released their games and the only way to play them was a subscription service, you'd have a point. But a third party like Gamefly, Redbox, and so many others are nothing like what you are describing.
If anything, you're the slave thinking you have to buy games to keep the status quo.