Ok, seems like the money is frozen on my PayPal account (it's not sent yet), why I freaked out is that I got a text to my phone from the bank that said: "Successful card payment - 263 USD; PayPal *Massdrop Inc." It's really surprising thought, that to check that I have sufficient funds, they have to freeze that amount. In that case, it's really not different from taking the money right away.
The waiter doesn't check whether I have got enough money when I go to a restaurant, nor does he take the wallet for a deposit. I thought Massdrop trusted their customers that much.