Why do people try to avoid it when someone wants verification that they’re real?

Like i ask for a real time selfie from someone i meet on instagram, for verification and they’re like “i dont need to prove myself to you” and stuff like that, like WTF? Like what are you hiding that you won’t do this simple thing? It’s ridiculous. You’re literally saying that you’re a scammer by not doing that. If you’re real then showing a picture won’t do much except prove that fact but if you’re fake then you’re exposed so that’s probably why you won’t want to
Why do people try to avoid it when someone wants verification that they’re real?
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