But they all can be categorize as image right? yes of course. so if you are to punish a user for posting a "infographic image without source" then you should punished those who post meme, and other images, picture etc without link to source too which just sounds funny to my hearing. Like I said before if this images have been edited, removing creators identification like watermark, name etc and posting it as theirs (i.e claiming ownership of the infographic image with their own name, watermark etc when posting), then we can consider those cases as plagiarism but for an infographic image like every other images just been shared I see no problem with that since such act doesnt present itself as claiming ownership of the infographic image as plagiarism posts does.

The creators of each infographic image should add a watermark to their image so we can easily identify who the owners are when we see them. But if they don't then don't blame the sharer for not linking a source, we shouldn't distract ourselves now, the crime here is plagiarized post/article these are what the shitposters are getting paid for not images.