I would have said, "The FAA will find out when they ask for the source of your video and you are not able to provide a source with the proper licensing (Part 107…)."
The FAA is cracking down on these "for profit" videos, I've seen several YouTuber's videos on the FAA contacting them about their videos even though the videos are free viewing on YouTube, the videos are "monetized;" therefore, each view earns them some income; so they had to get the Part 107…
THE FAA even specifically spells this out on their web page, "Recreational Flyers & Modeler Community-Based Organizations" under the heading, "What is a Recreational Flight?, -- Note: Non-recreational purposes include things like taking photos to help sell a property or service,…"
And you can remind them that the fines can exceed their commission on the sale of the property, see the link…
"FAA FINES PHILADELPHIA DRONE PILOT AND YOUTUBER $184,500"
FAA Fines Philadelphia Drone Pilot And Youtuber $184,500 – DroneXL.co