I am guilty of this, mostly because if I have to repost memes from somewhere, I’d rather it be somewhere off the fediverse so people don’t see double. It would be hard work to only post oc, and my oc isn’t always received as well as reposts. I personally aim for there to be regular posts by someone in the communities I post in, and collecting reposts allows me to build a backlog I could never build with oc alone.

Besides, I don’t believe in meme ownership unless it took a significant amount of artistic talent to create. Since that includes none of my posts, I do onto others as I want done onto me.