Alot here but ultimately I have to agree because the focus is on intent. If your intent to fly for fun one early winter day and you fly over your house and get shots of the roof, no problem. Then next summer, you notice leak problems and you reach out to a contractor and he says please send me a video of your roof, remember that video from last winter? Send it!
It's not the video or the photo that gets marked as commercial or recreational. It is the flight that bears the marking. If the intent of the flight is marked as recreational then that flight is forever a recreational flight regardless of the ultimate disposition of the photos or the videos resulting from that flight. Those videos are forever "recreational" videos or videos as a result of a legal recreational flight. Nowhere in the FAA rules do they prohibit the sale, delivery, transfer, or commercial use of recreational videos to a commercial entity or for purposes of non-recreational activities. In other words, it's a bit of a reach if one were to review the video or photo contents and then try to determine if it resulted from a recreational or commercial flight.
This is a bit harsh but I'm going to throw this out there as well. Once your flight lands, that's it....it's over. Either the flight was legal or it was illegal. If your intent was for fun, then the flight is recreational and that's it. That doesn't change depending on where your footage ends up, how much someone pays you for the footage one day, what you do with that video, etc. If you sell the video and get paid then a violation would likely occur only if it could be proven the intent of the flight was disingenuous....meaning, the intent of that flight is not determined by the ultimate disposition of the contents resulting from that flight. That's backwards. It has to be this way because 1) you don't always have control over what happens to your footage and 2) how it is possible to change your intent by specific activities such as selling footage or giving it away, etc. If you have a part 107 and you inspect a building and then you take the footage and share it with your family for enjoyment, does that change the intent of your commercial flight to recreational? Nope.