I've heard of dozens of stories about Paypal along a similar vein. "They locked my account for unreasonable reason X and now are keeping the money".
Most of these stories seem anecdotal. Can someone point to a rigorously documented set of cases where both Paypal and the customer's side of things are reviewed?
Over the last few years, all of these "Paypal screwed me" stories have sounded like all the complaints a few years ago about Apple seeming to reject apps arbitrarily. As far as I know, the complaints about Apple from devs have largely died down since we've had a fairly straight-forward list of do's and don'ts to work from.
If most of the people reporting problems with Paypal are doing things that are inconsistent with their policies and then saying publicly how they're being screwed, then that creates a negative reputation for other people who have never personally had a problem with Paypal.