Socialists hate Big Everything except Big Government
Whenever socialists want to attack a business enterprise they don't like, all they have to do is Go Large. Make it Big.
Big Oil. Big Coal. Big Insurance. Big Pharma.
To a Democrat socialist, putting "Big" in front of anything is tantamount to declaring that object an evil of such magnitude that nobody would dare to disagree with them on it. (A variation of the argument from intimidation).
This is a Big Pile of ****, because they certainly don't seem to object to Big Government. Only Big business is evil, Big Government is ... well, something else.
This tells you everything you need to know about the Democrat/socialist philosophy:
Big companies get big and stay big by providing - through mutually beneficial, voluntary trade - what their customers want. To a socialist, this is evil.
Big Government gets big and stays big by mercilessly taxing its citizens, generally against their will, for the benefit of special interests, in order to buy votes. To a socialist, this is good.
This should demonstrate more clearly than anything else that the foundation of socialism is coercion.