memes

Even if we completely ignore the overhead involved in buying and selling property, moving is expensive, stressful and completely upends your life. Expecting new parents to move every time they need more room, or even worse, forcing grieving parents to move because no longer "need" the space is ridiculous. If we aren't complete monsters about people only having exactly the amount of space that they need at any given moment means that there will have to be a number of people with surplus space at any given moment. And at any given moment there will also be a number of people who need a place to stay, but may not plan on staying in that one place long enough to make it worth "buying" somewhere to live. So, I don't see how you can stop people from letting others who need a place to live from living with them. So landlords have always existed and always will.
On the same note there's no way to stop 2 people with similar goals from helping each other, so companies will also exist whether you want them to or not.