Anyone can use it, unless Satoshi Nakamoto comes out and says you can't.
It is "prior art" for anyone else:
It is "prior art" for anyone else:
Trademarks, copyrights, and patents have different laws. The term "prior art" applies to patents. Trademarks do not have that concept.
Also, trademark laws vary by country. Trademarks considered generic in some countries may still be protected in others.
Yes, law is a matter of geography and I was being flip and cute with the "prior art" comment.
I well understand the difference between patent and trademark
Something being legal, doesn't also make it right.
Quite often the opposite is the case.