Sure, I do as well, I have my own VPN into my home office that lets me run traffic outbound through its default gateway while I'm somewhere else. But letting random third parties I don't know run traffic through my house is another thing entirely.

To be clear, bot spam and social media manipulation are legitimate business needs for the business selling said services.

You're free to let strangers download illegal images from a proxy running on your IP, but I sure as hell won't.

If only ISPs would actually crack down on (usually unwitting) users whose systems are participating in a malicious botnet or otherwise have their networks compromised. They could offer temporary disconnection + anti-malware support to get the user cleaned up, if they actually gave a shit.

I wonder how informed the end user actually is, and if it's disclosed to them what kind of content might pass through their network as a result of agreeing.

Those apps just shouldn't exist.

I don't know how "join your users to a botnet" became some kind of legitimized monetization scheme. Ads are bad enough. What's next? "Participate in a DDOS in order to use our app?"

Oh yes they can. If I'm a consumer, I pay for my connection that is sold to me and held in my name. I have no right to "resell" or "sublet" part of that. It is usually spelled out in the Terms of Service or Acceptable Use Policy.

At the very least, consumer connections explicitly disallow "Commercial Use". That means that you can't use them to run a business. You can't use them to turn a profit. You can't use them to generate revenue. That means no running servers, and that means no "reselling 2% of your bandwidth" for a few pennies because some Euro-Trash-Stranger wants to borrow it!