Susan pointed this out to me today.
Her daughter's got into a realworld version of Quidditch. Brooms, yes; flying, er...nope (rules explained here; other examples here and here)
Just a reminder that once your brand is out in the world, being used by folk, it's not yours anymore. Whoever owns the IP, the trademark or the patent, it's them out there that own the brand
But this is a double bind: if it's not out there - being used, reused and mashed up - it's not worth anything