Intrigued by the condition in the poll, 'if it were secure'. There *is no security* if we can see a photo in our browser. Any image we see may be downloaded to a users machine and used anywhere else they choose to post it. No workarounds, such as JavaScript, because those who would steal the image would only need to take a screenshot and then use the image(s), anywhere else. So; those who wish to protect their privacy, should exclude their face and blur any tattoos or other distinguishing marks, which may reveal their identity. When I was on a dating site I saw a guy whom I recognised. He was a friend: still is a friend. I wasn't even looking for guys. When we met for a drink, I mentioned my using such a 'dating site' and asked if he knew much about them. (I didn't mention I had already seen him). He thought there was no harm; that it was just a bit of fun with women but that he hadn't yet received any messages. I logged in to 'check if I had received any messages', and then did a search. Again, as before, up came his profile with photos and a video of him playing - all of him, including his face and him cumming. He was ok with the whole world watching him but was uneasy that people he knows can watch him. He's worried who they may be and he is anxious when he meets other friends who may also have watched him. So, just conceal anything that may identify you to those you know.
