The problem the previous poster was descrbibing wasn ot when you act as an ISP, but when someone manages to log into your wifi (either because it's unprotected

The problem the previous poster was descrbibing wasn ot when you act as an ISP, but when someone manages to log into your wifi (either because it's unprotected or unintentionally vulnerable), and performs criminal activity. The US legal system has reliably shown itself willing to pursue the owner of an IP address, without going to the trouble of showing the owner was in fact the one using the IP for that purpose.