That is, it's true that they tried to do it and the software exists. But it doesn't matter, because nobody is actually motivated to join the cartel (defecting is more profitable) and they have no enforcement for it.
That and if you don't rent out a property for long and leave it unused, it'll literally rot because nobody is there to notice squatters or water leaks or etc.
You must not have been renting apartments in any significant market during the 2010's