P2PB2B is a very complicated exchange for now, the exchange is often experiencing disruption or system maintenance, even for transactions we have to wait so long from the initial exchange of coins, but this exchange has been in crypto for a long time, some friends said that they once lost coins on the exchenge , but I've personally never experienced it, it's just that what I don't like about this exchenge is the complexity of transactions and the frequent maintenance of the system.
P2PB2B is a small exchange and has also been hit by bad issues so you don't have to stick with it for a long time, and maybe a case that your friend has said is true, so you can already make your own reference to it, let alone many improvements arising in the exchange makes the potential for loss even greater there.