Nice. They should probably add HTTP headers (X-Robots-Tag) to the list. Cloaking, too.
1,902 karma · joined December 18, 2013
Sounds like Java applets.
That got a good chuckle out of me. It actually shows how there's not just "text".
edit: the page says the transforms are done locally, but maybe you could also offer a hosted API so screenshots can be replaced automatically.
I don't blame them. Cloaking couldn't be detected otherwise.
edit: I'm probably wrong