It's just a photo. The photos that the article refers to are not works of art. They were not meticulously planned, they were not taken by experienced professionals using expensive professional equipment. They're just photos made by people who happened to be in the right place at the right time. They then decided out of their own volition to share their photo online, an act that takes less than 1 minute of their time. If commercial organizations start (ab)using the photos then I think it's good to point that out, as they are making money off of it. Otherwise I'd say: happy sharing.
Personally, I don't take photos for money. Every photo I publish on my blog I consider to be in the public domain, and I'd be glad if people use it. If I enjoyed making it or if it didn't take me any effort to make it, then I'm happy to share it for free.