Maybe you can find what you "think" they were charged with?But I don't think they were charged with that.
I think it is pretty clear that they were charged for making 65 unauthorized commercial flights, 43 of those in highly restricted airspace.
Now back to the OP, I don't think a flight 20 feet above a roof is going to cost you any fines. In fact I could pretty much guarantee it won't. But it only takes one complaint to put you on the FAA's radar. You can google warning letters from the FAA - some have been discussed on this forum - there have been enough sent to people to cease and desist their flights to make me believe the FAA does have a mechanism to "watch" us, whether through YouTube or filed complaints.