You can define the license conditions under which you upload your pictures in your settings. I just looked at one of yours, which was CC-BY-NC. NC stands for non commercial. If that field guide is a commercial one (which I would assume) and that photo had the same license, you should be able to sue them for copyright infringement. (I am not a lawyer though.)
I can’t speak for iNat, but I would bet they have nothing to do with this.