Those pictures of you doing a keg stand at a Toga party which you shared only with your closest friends? Well now they are in a nationwide PSA about binge drinking.
Those pictures of you with your ex girlfriend on a beach vacation? Those are now in Carnival ad about whisking your loved ones on a cruise. Your wife is pissed and even deleting the photo off Instagram doesn't do anything about it.
If you are ok with all your photos becoming public, then sure this isn't a big deal. I think many people aren't.