Adios
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It would certainly be annoying to see my photo somewhere commercially with a © FuturePLC on it. But it wouldn't be a financial lose unless I had some commercial plan for it myself. I'm not that bothered personally but credit would be nice.As you say, any photo posted here has to be of such low quality as to be unusable for publishing purposes (photos used for publication have to be of high resolution and lossless compression). The $64,000 question is, what about photos LINKED to from here? Many of us have posted photos hosted elsewhere, and the various elsewheres also have T&Cs that often have similar clauses, or clauses saying no commercial use or whatever. For example, if I linked to an image on Wikipedia, Wikipedia insists on a Creative Commons license, and if I linked to one on Facebook, Facebook probably owns rights to it, as well as a lien on your soul! Unless you link to a domain you personally own, it is likely that third parties impose T&Cs that often look very like those of this forum.
I've never thought about adding my better few photos to a commercial library, anyone tried it?