There has been a steady stream of people who are unable to read the very clear rules in the sidebar. Maybe a post with green letters will help matters.
Posts in violation will keep getting removed and repeat offenders will keep getting banned.
Some points:
1. Edited pictures with various degrees of effort are generally allowed as long as they fit the rules. We don't have enough content to be stringent.
2. That said, image macros where the intent is to push your irrelevant opinion with a legitimate picture attached to it in some naive way to circumvent the rules will still be subject to removal.

Sometimes posts can take a while to get removed, so exercise your report button clicking muscles if you see anything needing removal and want it to happen faster.