You can't remove something that you've posted to the internet.
Its easy to find a support team willing to take down content that is hosted on their platform for you (imgur, gyazo, lightshot, etc), however its impossible to remove a file or photo from someone's computer once they've downloaded it.
This is where the true problem starts as once someone has downloaded your content they're free to share it wherever and whenever they want. If no actual people see it, then it is most likely one of the billions of bots across the internet.
So, yes it is true and its somewhat horrifying to think about.