Not at all, you have very good points but that really only works if you have your real name really. If you post an image with a sign reading "anduweb" what it really proves? The whole thing of verifying your identity by posting an image with your nickname is amateur at best and sloppy and a complete security risk if used as tangible proof at worst.
What's the intention also? I have accounts in Reddit, Twitter, Facebook, Youtube, Google, I don't mind giving information to companies that are providing me a service (and I'll gladly do the same if Steemit had that option).