The new T&Cs (as I read and ticked today to enter the site) seem more reasonable now - Having said this, there is still the point that a photograph can be copied from the site; and for pictures you value for their possible commercial potential, watermarking or similar limiting process is probably very wise.

(Remembering that with the editing software available today, low resolution pics can be made high resolution very easily and with a skilled editor markings can be cloned away)

Regards
Andy