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Simple: almost all listings are from agents / agencies. Their incentive is to rent as many apartments as possible, as often as possible, at as low a risk as possible.

This is why I only rent directly from private owners who have 1-3 units total. Then the negotiation can proceed among equals, and there's a far higher likelihood of getting treated like a human being.

Of course, finding apartments becomes much more difficult under these constraints, but it's been worth it to me.