google "residential proxies for sale" - there is a whole huge grey market in selling proxies from peoples' actual residential internet connections, usually to be driven by bots or people in click-farms somewhere in a low labor cost location.

If you want to appear to be a legitimate comcast, charter, centurylink, frontier end user on a last mile broadband connection in a house somewhere in the US48 states, that's a standard service that fraudulent organizations make use of now.

Usually using software that people have been tricked into installing on their computers.