EDIT ADDED THIS: Also I guess I think that his credentials -- in this case -- are a big deal. Anyone can sue anyone for anything at all and it's up to the courts to quash all the bullshit lawsuits. Since lawsuits cost money to file (if you're not a lawyer) or time (which is money if you are a lawyer) the millions and billions of frivolous lawsuits that could be filed generally aren't. Obviously this guy could be filing a totally bogus lawsuit just for the publicity but that scenario seems much more likely if he wasn't a former DOJ lawyer.
EDIT AGAIN: Just saw that this guy's deal is nuisance lawsuits. Bummer. I was hoping this was a real thing that would get legs.