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I run a pretty big fan page making custom edits/videos and there's a couple pages just Reposting our stuff right after us.

They are gaining lots of traction and my reach has been cut because of this. Any way to send bot traffic or something to take them down? Thanks

You could try watermarking your content and then complaining to Instagram:

Specifically, Intellectual Property (assuming you own the rights to the content you posted - game walkthroughs, fan posts, ... would belong to the original game, movie creators and not the person who created the uploaded video, post)