Looking at Luminati Ethical usage they seem not so bad.
To everyone wondering what they do, they are a proxy provider, using customer devices to serve as the exit points. If you wanted to, for some reason, browse a website from Frogballs Arkansas, they’d give you that ability. They would find a device that has an app with this SDK installed AND the user has opted in, and that device would make the requests.
As a consumer, I would be incredibly concerned about opening myself up to liability. A customer of theirs could be using your device to search for illegal material, leaving YOUR device info in the ISP logs. Who do you think would be the ones with the FBI at their door?
Definitely a grey area. For a developer, that’s not your concern. This is an opt-in system, according to their website, so the consent is fully in control. Buf any customer of yours would be stupid to opt in.
I advise against it. Users are not smart. I wouldn’t feel good about exposing them to such a possibility, even if they have to consent themselves.