Not alarming at all, but quite sensible. THe DOJ has limited resources so it has to make judgements about how best to employ them. It should aim where it thinks it has the best chances of detecting breaches of federal laws. I think aiming at these dubious business is a good strateg. People dealing with drugs, porno, sex, ponzi scams, gambling, telemarketing etc, do seem to me to be more likely to reward some DOJ investigation.