They might have provided a service that would be beneficial to the consumer and they might have hired a bunch of programmers once they had established themselves. The established companies already in the market would have had to lower prices and become more efficient to compete. Instead, the competition is crushed, you never hear about it, never know about it.
This is what this law is designed to accomplish. Nothing to do with Paypal. Stop talking about Paypal.
Many regulations serve the interests of politically well connected powerful oligopolies in this way. This is just one example. The reason put forward is always that this is some way of protecting you. That, if this regulation didn't exist, these companies wouldn't have to be responsible. In reality, it strengthens the hold on the marketplace of the oligopoly already in place and makes you more vulnerable to them.
Keeping companies out of the marketplace stifles competition. This is not good for you, the consumer.