That has indeed happened to me. Sometimes I've felt like complying with the kind request, others I've elected to decline. In the latter cases, the moment they revealed that the option was not in fact optional, I left the shop out of indignation. In the former, the harmless pictures and texts actually proved themselves harmless: if they didn't, if there were a history of harmless pictures that are really harmful, I would never ever accept to look at one again.