My guess is that Paypal is starting to get tired of the constant bad PR they are getting from being sued by so many people for having their funds held for extended periods of time.
This new policy update seems especially odd though, considering Paypal's new president recently stated that he wants to "radically change how we deal with holds" (see this). I guess "radically change" can mean for better or for worse, lol. I guess time will tell.
What do you guys think?