Capitalism is NOT about the rights of the wealthy.
Capitalism inherently means literally only one thing, capital controls the means of production. Who has the capital? The wealthy. Who therefore has the right to control? Yeah. That's right, the wealthy. Capitalism IS about the rights of the wealthy.
If I buy something, I OWN IT. Not you. As I own it you do not have the legal ability to put ANY contracts on it. Your belief that you can sell it but still somehow prevent me from doing with it what I want is anti-capitalist plutocrat philosophy.
Capitalism is about control of PRODUCTION, not about control of stuff you bought. That is orthogonal to capitalism. You have to have the right to own property for capitalism to exist but that doesn't give you the right to do whatever you want with it.
Rental agreements are different
Rent seeking is orthogonal to capitalism as well, because it's not about production. Hell, it's barely even about ownership, since you can sublet.
TL;DR: All the stuff you think is capitalism is really about a specific form of capitalism with other things added on. Capitalism is NOT inherently about free MARKETS. You can have mods on capitalism to try to make it make the freest possible markets, but they aren't the soul of capitalism. Rich people controlling stuff is.