Is "Olympic Games" copyrighted? Even if so, what's to stop the Greeks from claiming prior art, and establishing an Olympic Island themselves, sans-IOC?
A phrase/name can't be copyrighted and prior art is irrelevant to copyright. Nothing stops them from claiming it, but it's a non-sequitur so there is really no reason to claim it.
I don't think any individual or organization is stopping Greeks from establishing their own Olympic Island.
