At least in the United States, patent trolls are professional lawyers who can serve paperwork for nearly free, have done this thousands of times, and in many ca

At least in the United States, patent trolls are professional lawyers who can serve paperwork for nearly free, have done this thousands of times, and in many cases are good friends with the judge. In the US, anyone can sue anyone, and it costs money to fight even frivolous claims. It is one of the major reasons that if you were to look at the professions of 99% of home owners in upper middle class areas, they are laborers at large corporations.