Depends - sometimes you see a concept that you think you can improve on. Or maybe you read about their workflow how they did the image, learn something new and want to add your own spin. I don’t think, that’s a problem per se, as art is often iterating and innovating and that this is the root of creativity.

The problem is more when everyone does it and the whole community gets flooded with the same image concepts/jokes. In this case, the AI communities may get hit even worse in this regard, as it’s very easy to generate images and there’s less skill needed than if you had to draw/photoshop/… the whole meme all by yourself, which means it’s easier to enter the dead-horse-beating.