VPN Services

[surferxyz]

Just because it is a little bit interesting, this mobile app is what people are running to provide IPRoyal their residential proxies: https://pawns.app/internet-sharing/

There is a similar service that provides an app, where you share your own internet and in return get to use other users (eg. a "free" VPN), called Hola.
https://hola.org/

They also have a commercial side of the business that sells access to the Hola network: https://brightdata.com/

It used to be possible to manipulate the Hola client, to get free access to the residential IPs. Although I remember something about it kept making it so I couldn't send many requests before I was proxied through one of their supernodes (just a server they were running).