They all used the same logic to make this decision, that's how. They all saw suspicious patterns of trading by retail customers and made the typically overly cautious decision to restrict trading until they receive guidance from the powers that be.
You're going to have to source that claim, friend. There is nothing more fundamental than supply and demand. The action to allow people to sell but not buy is not overly cautious, it's obviously advantageous to the short interest.
