because its just some random GIF with a link to their post that has noting even to do with what your post is about !! or its a random link saying up vote this ! Or something like that , if you get it in your comments you can just tell its from a bot the GIF is totally different then what your posting about ! Like "mm mm yummy food "( as an example) When your post is about "the price of steem "say ! 👍👍👍