"When you create an account to use the forums here you are agreeing to abide by the rules and user agreement of Reef2Reef. All data entered as post, photos, attachments, belong to Reef2Reef."A quick Google search shows this image posted on Reddit a year ago. The OP of that thread has been suspended. They might not even know that it was previously posted on R2R.
Have you read the R2R TOS? It doesn't say that they have ownership of the image. It just says:
this was thing i was referencing im prolly just interpreting it wrong