Looks rather sketchy but kudos for technical effort I guess. What are you using for backend? Proxy farms?
The shady type that runs on people's home PC's. Either via Trojan type hacking or some paid incentive to the home user to install the proxy.
If they've found some other loophole, that would be interesting.
No Torjans. No Hacking.
The most shady thing we do is web scraping Google because it is against the Terms of Service.