Why is this a blackmail goldmine? I am ignorant of Grindr, but what I have heard it is basically Tinder but for gay men. Would Tinder be blackmail data? It's hook ups and relationships, dating, etc, no?
Absolutely when cross-referenced with information from OPM database. Employee with TS/SCI clearance working on a <military project X> hasn't reported reported his gay affairs (that his wife might not know about even). The Chinese find out, approach him and make him an offer "Look buddy, how 'bout we become friends. You just tell us what you know and we'll give you some money and most importantly keep quiet about your meeting with your secret partner on such and such dates or places?"
Or, "Lets not become friends. You can tell my wife. She thought it'd be fun to do that!" aaaaand so much for that blackmail. And just don't forget to tell the security officer that someone tried funny shit.
And I'd suspect that there are more than a few married (nominally heterosexual) men seeking out extramarital affairs on Grindr.