I hope not. My pets in there would complain to no end if that ever happened.You let the top dry out?
No idea about your Wiggle Worm, but if it's widely available online it might be a good source for people that can't keep their own worms. I wouldn't say the availability of higher trophic level arthropods are very common in bagged store-bought amendments however. I bet there would be people who would actually complain they found bugs in their store-bought castings! lol