I understand your concern for the safety of nesting birds, and it is a valid issue. However, in my experience, the vast majority of nest destruction and disturbance I’ve observed has come from people NOT knowing where the nest is, what it looks like, or how to avoid destroying it while doing other activities. People are generally very respectful of them once they’re aware of their presence.
I think banning nest photos would only add to this lack of information, and hinder a lot of well-done responsible documentation in the process.
I have seen the occasional less-than-ideal disturbances of nests by new users on this site, but so far they’ve all been extremely receptive to some gentle education about why the birds might be disturbed by their behavior and how to avoid stressing them out.
Obscuring the location for nests of birds that you feel are in vulnerable areas or might be of interest to poachers is always a good idea though.