Why what? It isn’t clear what you’re asking.

They need to use what every ten years? Even the “throwback” logo is a new design, separate from any previous one. Do you have any sources, or are you just speaking from assumption?

I don’t claim to be an expert, but I’m pretty sure the “rule” is specifically about there being porn of any fictional character or piece of media you can think of. Not like, literally any concept you can think of.