maybe paypal banned them cause they say "100% Server uptime Guarantee" Which is pretty much impossible
No it isn't. Legally, a "guarantee" is just a promise to pay a certain amount of money if they can't meet their obligations. So presumably, their 100% server uptime guarantee means they'll compensate users no questions asked if the server ever goes down (though the liability limitation in their TOC specifically excludes "damages", so any compensation would be limited to just a refund). Seems perfectly reasonable to me. It's like those 100% customer satisfaction guarantees: it doesn't mean 100% of customers will be satisfied, just that the ones who aren't satisfied will get their money back.