You give us the right to use it (you can't propose it and then pull the plug if you get mad at us for something) but I don't think you relinquish the right to use it on your own independently, either.
Oh, sure, you can use it, no problem. But if, say, Four Star Mon uses it first and we don't call it the "Bulbagarden system" (I'm talking about the promotion/demotion system in general, not the tier system, which would be Bulbagarden), will there be trouble there?
Or if the reverse happens and Four Star Mon uses it afterwards but still calls it by our own name?
Sorry, I'm talking about the algorithm, not the tiers themselves. I'm not sure you guys would want the promotion-demotion system to be called "the Bulbagarden algorithm".