The post doesn't have a lot of info, but the only rational explanation I can think of is that Paypal believes Mailpile is a scam intended to solicit donations through false pretenses.
Have a large number of donors issued charge-backs (or whatever the paypal equivalent is)? Has Mailchip missed some sort of deadline that might have caused donors to complain to paypal? Regardless of any of those things this action seems on the surface to be a huge overreach by paypal, but at least in those cases it would make some kind of sense.
Also, I assume there's something in the paypal use contract that gives them authority to take this kind of action? Clearly not a good idea to keep any significant balance in a paypal account.
Have a large number of donors issued charge-backs (or whatever the paypal equivalent is)? Has Mailchip missed some sort of deadline that might have caused donors to complain to paypal? Regardless of any of those things this action seems on the surface to be a huge overreach by paypal, but at least in those cases it would make some kind of sense.
Also, I assume there's something in the paypal use contract that gives them authority to take this kind of action? Clearly not a good idea to keep any significant balance in a paypal account.