They are, but it takes time to get enforcement – and that's assuming that the PE firms don't do something like buy enough $TRUMP to get a private audience with the regulator's boss. If those two firms don't have enough assets to survive through years of legal actions, they're going out of business even if the other practices follow them.

Even if the PE vultures give up, it can sour areas for a while: they start a price war and force everyone to lower prices, slash staffing, etc. If they give up after a couple of years when it turns out to be harder to corner the market than they thought, the surviving businesses are still in a worse shape and have the unenviable task of trying to restore prices / service to previous levels.

They are, but you're still out of business, and they have enough money to wrap you up in paper for awhile.