They certainly have. Here is one from 2010 when they held over 600,000 euros from Markus Persson, the creator of Minecraft for 'suspicious activity' that they wouldn't disclose. It's a good thing for him that he was so well known. https://notch.tumblr.com/post/1096322756/working-on-a-friday..., https://www.devicemag.com/2010/09/10/paypal-holding-over-600...