As far as I know, "Units of Evil" refers to the degree of the violation of your IP address when you register for an account. It's a system that prevents users from using the same IP address to create multiple accounts.
Here's the image (zoom in):
https://bitcointalk.org/banmap201805.pngFor comparison, here's the one from 2015:
https://bitcointalk.org/banmap201510.pngEach pixel is a /24 address block (ie. each pixel represents 256 IP addresses). The colors are:
█ Zero or nearly zero evil
█ A small amount of evil
█ More
█ More
█ At this point you actually have to pay if you register an account in this block
█ More
█ More
█ More
█ Pretty high
█ A ton of evil, more than anyone is likely to pay
