I received a very prompt and polite reply email from Nilesbio just this morning!

Thank you for emailing us to clarify your question! We only sell our live
material for educational purposes, and not for feeders. I am sure they would
be fine but we cannot guarantee the quality for that purpose. Our bugs are
typically used in a classroom setting for the kids to watch the different
stages and/or life cycles. Hope that answers your question.