It's because the owner of this patent is a patent troll who sues companies out of existence for building what you're talking about. https://patents.google.com/

It's because the owner of this patent is a patent troll who sues companies out of existence for building what you're talking about. https://patents.google.com/patent/US7062502 https://patents.google.com/patent/US7062502 https://www.theregister.co.uk/AMP/2015/09/07/sunk_by_patent_troll_iron_speed_stops_ops/ https://www.theregister.co.uk/AMP/2015/09/07/sunk_by_patent_...