You have raised a very important topic @allasyummyfood and is something which every new user should be aware about. I feel Posting Guidelines on Steemit should be included as a part of the welcome e-mail when the account is created.
Plagiarising is very easy in Photography related posts and unfortunately there is a flood of such posts under the photography tag. Just yesterday I wrote a post on how to find such copied photographs in a SINGLE STEP.
I hope people will find and report such posts to @steemcleaners
very good work!! well done for doing that!! we need to clean up that tag! i heard a lot about it!