You say it yourself:

> Residential proxies can be impossible to detect.

The appeal of residential proxies is that the traffic comes from legitimate user networks. So how do you detect malicious usage there?

Moreover, it must be a game of whack-a-mole to keep your lists updated, as these services pop up all the time.

Very interesting service, but sadly I cannot sign up for a trial, due to not possessing a US telephone number, which for some reason is required. That said I am a researcher at an Internet measurement and security group. Any chances for a cooperation?