It's not like it's a huge thing, but some of the groups you've posted this in aren't for photography. They're for fanifiction writings. Like, you have this in the country x reader group, which isn't a group for photography, it's a group for the anime/manga series called Hetalia.
I guess some people just get annoyed when they're looking fro writings and get photos that have nothing to do with the base theme of the group.
I mean i don't really care. I think it's cute. But still.