Agreed. Back when I did my internship with DOJ, it was clear that on enforcement issues, the fed agencies do not try to stretch their jurisdiction unless there's money to be made. Homeland Security would not be able to make money off of license fees, so I seriously doubt that they are going out of their way to enforce it.
Was "back when", before we had things like the IRS going after people on political affiliation"?
Seems pretty clear now the feds are politicized and being used as a tool to hammer the opposition. I don't think the money has anything to do with it, except incidentally. (you know, like ATF "always think forfeiture"), little stuff like that.