"Paypal did for eBay and it worked out for them", which is true but it should also be noted that it worked only after eBay launched a competing product that Pay

"Paypal did for eBay and it worked out for them", which is true but it should also be noted that it worked only after eBay launched a competing product that PayPal was able to beat despite the enormous distribution advantages that an eBay-run competitor had.