If someone puts up a site or page claiming to be a company or entity that they're not (i.e., "We make Stack Overflow, where the world's developers get answers..

If someone puts up a site or page claiming to be a company or entity that they're not (i.e., "We make Stack Overflow, where the world's developers get answers...") then that's not a domain name or TLD issue. It's another issue altogether that should be dealt with legally.