rent doesn’t exist in principle, it exists in practice. and in practice, the history of rent is a history of wealth extraction
This is a completely useless stance when you want to figure out if rent itself is morally good or bad.
There are a lot of instances of rent today that are completely fine. For example, my parents rent 2 rooms of their appartement to university students, and they just ask for a share of the costs they have, proportional to the size of the rooms. That is rent, but free of other influences like profit maximization, and all parties seem to be very happy with the arrangement. Or if you rent a tool or car from a local company, you’ll pay mostly for a share of the acquisition and repair costs, and a bit on top so the owners and employees of the company can keep the lights on. There is absolutely nothing wrong about this form of rent.
If you’re saying that rent + limited supply + capitalistic profit maximation + corruption is a problem, then I absolutely agree with you, but it would be false to blame that on the rent part of that equation. And I would definitely not go as far as saying that private property in general is bad, expecially not very limited private ownership like a person owning the house they live in or part of the company they work for. Too much concentration of ownership is a problem, not the concept of ownership itself.