I'd imagine it's steps taken to curb the continued nuisance of returning posters. A legitimate person is less likely to care about the linkage, someone who's only signing up to get banned might be stopped. Obviously there is ways around this. We've seen moon get banned again (waner), so it's not below some to fake social media accounts and buy burner phones to sign in again.
It might turn back some legit posters like your friend but most people nowadays have aleast one of Facebook or twitter etc, so it shouldn't turn away many.
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