You can be pretty sure that people are on here with multiple IDs alright. Just look at all the usernames that end in random numbers. Most people who sign up to something just once will come up with a name of some sort - babyface, smithers, happydad, anything at all without having to resort to "mary17" or "john75"
My original point is that with history I could see that (say) TickTock gave away a sofa in 2011, and has asked for a few things since. That 'give' is an indicator that this person is a contributor in general terms. The lack of a history isn't necessarily a bad thing, but the presence of a history gives some degree of 'cred'.
I'm not saying that I would only give to someone who has given before, but that in a case where everything else is equal I would choose them over a person who hadn't. Right now, all you have to go on is their spiel.
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