There is absolutely nothing wrong with institutional investors buying tract homes and renting them out. Nothing! It brings the benefits of living in such homes to people who otherwise would be excluded from them by the financial credit system.
Well really I was just trying to explain the GP's post, not adopt their views, but I think I can play devil's advocate here for the sake of discussion.
The problem with institutional investors is that in making it big business you drive up home prices which in turn drives up the rental prices. Since they can have a wide portfolio of homes, they are less likely to lower rent prices when demand drops, because they can afford to take the short term hit if it they think the market is going to pick back up again. AND they can play games like grabbing all available homes in an area in order to artificially inflate prices.
The article linked in the OP, and many posters in this thread, present arguments to the contrary. The main one seems to be that although institutional investors are happy to let people “benefit” from renting their homes, they are precluding many from ever owning those homes themselves.