He uses that fluffy language but "resharing" is not an Instagram feature. He wholesale steals images.
That's true, but this is actually normal behavior in the instagram world since it doesn't have the concept of share/retweet. So you screenshot or use some app (ie regram) that re-posts someone's content and credits the original user.
Instagram is full of multi-million follower accounts doing this, it's very much an accepted practice on the platform. If FB wanted to disincentivize this they would, but they haven't.