I think we can reasonably expect people to figure it out on their own ... It is made very clear that an image macro is a one-liner, and since we are talking about one-liners in the Community Rules, it would obviously lead to a warning, otherwise we would talk about it elsewhere that is not so serious and severe.
People who use image macros and who are concerned with this rule know what image macros are, I believe.
People who use image macros and who are concerned with this rule know what image macros are, I believe.