I did some trading on P2PB2B more than a year ago. I am lazy to tell the whole story, but I confirm the information about fake volumes, bots, shady KYC, lack of customer support.

Finally, I was able to make some succesful trade there and I successfully withdrew my crypto (though it took a day or even more).

P2PB2B is probably not 100% scam. However, I strongly DO NOT RECOMMEND this exchange. This exchange is the worst from 10-15 exchanges I had experience with.