It's not all trojaned home routers and PCs, at least not in the sense that the user is unaware that they're running the program (even if they're unaware they're

It's not all trojaned home routers and PCs, at least not in the sense that the user is unaware that they're running the program (even if they're unaware they're routing traffic). For example, all/most the mobile IPs offered done through offering SDKs for app developers to implement and paying them based on usage. Now that phone is a relay while that app is running/backgrounded. Those free apps don't just make money off of ads, they make money this way too. For those, it's probably in the fine print what's going on, but people are conditioned to trade something non-monetary for usage these days, even if they aren't really aware of what they're trading.