Paypal something block funds as they see a huge money in and out,that happened with the most paid to click websites,for those who sell online usually gets a chargeback ,soo paypal is hard to get money from those,bitcoin once sent is done cant do nothing ,i believe we will see the market adopt bitcoin over the years and taking out paypal option.
Actually, it's good for online business like shopping. I mean, when you get scammed, you can use chargeback to get back your money. In the other hand, bitcoin don't have that option.