You only need to recall where it took the Internet Archive, no matter the intent it has. But let’s presume for a minute that a lot of it is educational: does unsolicited art reposting constitute an educational purpose, commentary, criticism, news, or a parody? If all that fails to meet, at least work with the portions that you’re taking.
Whether the meme is meant to be shared in some other context or not, I think, is the decision that should be based on the sum of copyright liberation and how generalistic the contents are. Today, I can’t bear a thought of reposting some stranger’s niche meme on social media without at least attaching a source or creator, because I’m most likely making one more point where engagement with the same meme ends - and reposting full works doesn’t qualify as commentary/criticism/research, so it’s not a fair use, to begin with.
That’s why we are correct of assuming the worst from the bots: programming any fair use considerations is left to gather dust, as it’s ultimately something that human has to decide.