Probably because boar meat is not technically pork.

That's a good point. While it isn't common in the western hemisphere, insect farming appears to be well established elsewhere. Perhaps there was a lack of studies or the amount of protein produced simply didn't make the cut?

The study authors had this to say about their sources:

>We derived data from a comprehensive meta-analysis, identifying 1530 studies for potential inclusion, which were supplemented with additional data received from 139 authors. Studies were assessed against 11 criteria designed to standardize methodology, resulting in 570 suitable studies with a median reference year of 2010. The data set covers ~38,700 commercially viable farms in 119 countries and 40 products representing ~90% of global protein and calorie consumption.