It’s basically for images that can be used as a reaction to something. Check out this subreddit for a better idea: https://www.reddit.com/r/ReactionMemes/
The posts so far are getting downvoted but if my guess is right then people encounter the images in their c/all feed thinking I posted those images to a regular meme sub and should learn of this community as long as I keep posting. :)
This is wild. Didn’t knew gangs do shit like this.