Years ago, PayPal was an independent company which fought constantly with eBay to be allowed on the site as a way to settle accounts after an auction was won. Now, years after eBay bought PayPal, the payments service is elbowing out all manner of competition. In Australia, eBay is limiting purchases to either PayPal or cash on delivery — no checks or money orders allowed, let alone rival electronic payment methods. In the U.S., eBay was sued last year for tying PayPal too closely to its online marketplace. How soon they forget: PayPal is aiming to quash an economic freedom its founders, including noted libertarian Peter Thiel, fought for.