Probably he has got some history of past many clients with those accounts. But it's not recommended in doing this, freelancers are working based on their skills and reputation. So, renting out someone's account just to get hire doesn't make sense, your work will be credited to the account owner and not you as an individual freelancer. It doesn't make sense in doing this, you're wasting money, time and glory from doing this. It's possible that the rentee doesn't own the identity from those accounts by saying he's got male and female accounts there. Another thing from that platform, with the last that I've read from someone who's moved to another freelancing marketplace is that, it's now has a lot of scammer clients.