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ISnt it more likely that it is just bots, that know your domain cos they have lists of every domain for that tld?

Same question I had. Though it wouldn't be hard to control for, just put a random honeypot domain and see how many visits it gets.

I didn't read the paper, but you'd know it'd bit squatting if the domain a-azon.com is hit with a HTTP Host header of amazon.com.