Right, they are a monopoly until there is competition. That’s OK. You tax them higher until it becomes profitable for a competitor. That’s not ‘out of business’, just high enough.
But you can also accept the monopoly if the offer is transparent and good enough.
The colluding is a problem. It is the problem. It’s unavoidable. In every system there is corruption. This cannot be solved but has to be dealt with case by case.
How can the left not link immigration with the reserve army of labor?
The right thinks that limiting immigration removes the surplus. The left knows that there will always be a surplus but they attack the right on refusing immigration instead of first explaining the reason for the surplus.