I have a better solution. Why not just leave the Picture and Video Topics to the Uploaders to upload any content they may want to place. Then if a member wants to Thank the poster for their contribution they have the option of clicking the Thanks, Like or Upvote Buttons. Any comments placed that are not pictures and videos would just get deleted.
If a poster still feels the need to make a comment they can click the (+ Quote Button) and create a different topic to place their quotes in. All this arguing is doing is making uploaders stop uploading content then everyone loses by having no Video and/or Picture Content to view. Some content posted may seem old to some but new members joining the forum this content is something new to them.
We have done this move before and it can be done again.