https://krebsonsecurity.com/2022/07/a-deep-dive-into-the-residential-proxy-service-911/

[Condobloke]

A Deep Dive Into the Residential Proxy Service ‘911’ – Krebs on Security

 

[KGIII]

They're not the first. Hola did pretty much the same thing. If you installed the extension, you became an end node for their VPN, effectively. When they were called out on it, they added it to their TOS. I'm not sure where it went after that. Something like that, at any rate... They billed it as a P2P VPN - except they didn't even call it that until some earlier feather ruffling made them call it that. Users had no idea that it was a P2P anything at first.

Lemme find you a link.

Hola Better Internet Sells Your Bandwidth, Turning Its VPN into a Botnet

Hola Better Internet is a popular Firefox and Chrome extension that allows you to watch blocked content overseas. However, there’s something more nefarious going on behind the scenes: the company is selling the bandwidth of Hola users to anyone with money to buy, effectively turning its users...

lifehacker.com

That one looks correct, with a quick skimming. It's a little later and doesn't seem to tell the whole story, but it's close enough.