> These are not open proxies.

Okay, I was being imprecise. These residential proxies aren't "open proxies" in the traditional sense, but they're usually "open" to anyone willing to pay a small amount of money to use them.

> Most ISP abuse reports are routinely ignored. They might as well be a dead letter box.

This is where regulation might play a role, or at least a change in attitude. Companies shouldn't be allowed to pollute the internet in this way when they can easily prevent it.