Grey market residential proxy service providers are one of the most common methods of implementing bot spam, social media manipulation and plenty of straight-out fraud.

There's all kinds of things that malicious actors want to do where they value coming from an ordinary (comcast, charter, centurylink, shaw cable, whatever) residential IP.

Only if the app provides 1. prominently-displayed, informed consent, 2. an option to opt-out without losing app functionality, or 3. joining the botnet provides some kind of actual benefit to the user, besides just money to the developer.

No.

I'm surprised Comcast or some other ISP doesn't step in with a claim of tortious interference. Reselling or granting access to the ISPs services like this is almost always against the ISPs terms of service.

The consumer is in no place to consent to this exchange.

We have this invention called money so that individuals don't need to wrangle complex swap trades and instead sell the things (usually their time) that they are OK with selling with informed consent and buy the things they want without having to give up things they don't want to or don't understand. If selling your internet connection was a reasonable thing to do there would be dedicated apps/boxes for that instead of this being packaged into random apps.

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