CM the thing(software/code) you are talking about is bit complicated and expensive, thing which can recognize person based on their browsing pattern. Its that same procedure how visa companies know if some one else is using our card. or they way book store offer us books from our previous patterns.
Other then that its only ppl like your self reporting if some one you think is same person with different id. I don't think you would like doing it over and over even if you are mad at that person.
just my 2 cents.