Instagram pods are private groups of 10-15 bloggers that desire to increase their Instagram engagement and get more followers. While the pods are actively commenting and liking the blogger's posts, there is no guarantee that a sale could come from it. Comments to giveaways and contests, spammy comments are also considered non-authentic.
When the percentage of suspicious comments is too high that is a sign of low Comments Authenticity. The low percentage of suspicious comments raise your Comments Authenticity level.