I suspect child abusers generally move out of their landmark hotel room before sharing compromising pictures on the internet (and generally hang around in much less high-profile locations, for obvious reasons). Admittedly it would be a lot more forensically useful if the image had accurate metadata showing date taken.

I was hoping for something clever involving algorithms picking up subtle reflections that weren't visible to the naked eye and or algorithms automagically matching photos with other photos taken from similar angles, but this is Google-fu 101. If you tell people which city you're in and post a photo of the centre, people will probably be able to figure out where it was taken from. That applied long before the age of the internet and digital photography.

Situations where criminal activity took place would usually include police (with child trafficking, more likely even the FBI). To think these ideas or photo analysis techniques are new to LE is naive.