One bluebird shutdown here. No email for my wife yet but I haven't loaded hers in 6 months or more. <$2000/mo on average of gift card loads, just to meet minimum spend.

Edit to add, I am not surprised that Bluebird is shutting down or shutting down people who load gift cards, but I am surprised that the email is so vague and making it seem like there was fraud on your accounty rather than just coming out and saying the issue.