150 years ago Lobster was considered disgusting trash food only eaten by the poorest Americans. This isn't about taste, it's about perception and the availability of meat. The main difference between a Pillbug and a shrimp (in terms of edibility) is the size. Most small bugs don't have enough meat to be worth preparing in a way where it's not obvious you're eating a bug. It's pretty much just aquatic arthropods that can escape the limitations of air breathing to get large enough to be a more appetizing food source.