That is pretty funny, I wrote the code for that blacklist like 5-6 years ago when Thumbtack was being hammered with spam requests from China and India. I thought it only blocked POST requests, though maybe my memory is wrong or they have made the block more expansive in the meantime.

Anyways there is a version or ABBA usable on github or you can always get the source and run it locally:

Source: https://github.com/thumbtack/abba

Demo: http://thumbtack.github.io/abba/demo/abba.html