You resell a game, bundling a botnet proxy inside, and make it freemium: free if you accept T&C with a service allowing using your device connection for research purposes (or whatever wording could be even more confusing), or pay $20.
It's no longer a botnet, it's a "residential proxy" and you are doing clean business.
In my head this is Joe Pesci saying "the money is now laundered" in Lethal Weapon 2.
I didn’t know this was a thing. Yikes. I’m gonna freak out now and find a way to prevent that in our home network.
And I’d argue that’s not clean business, the user doesn’t know what their connection is being used for :)