I have been asking myself this same question too. or may be p2pB2B accept any kind of projects without much conditions attached.
That's exactly the answer, it seems that they are just taking whatever project demanding them to accept their IEO to the exchange, what they care is money after all and maybe that's the reason for their existence aswell. Just a little common sense and people could know that they are so fishy it's becoming too obvious. This will also further destroy IEO reputation if left untouched just like how ICO crumbles in the past.
That's the reality, they are just after the money that project will pay to them, aside from that, it will attract and will add more users to their portfolio, aside from listing fee, they can also earn from the trading fee and withdrawal fee, so why they will care for scam project right, in short they are too greedy persons, that's why I never trust their exchange.