.co, .tv, and .me are ccTLDs not gTLDs. They're the ISO 3166 codes for those countries. Some English-speaking people may treat them as global and not linked to

.co, .tv, and .me are ccTLDs not gTLDs. They're the ISO 3166 codes for those countries. Some English-speaking people may treat them as global and not linked to countries, but they're not. The difference with .io is that BIOT was never a country and soon won't exist - whereas those countries have existed and will continue [1] to exist. [1] quite possibly with the unfortunate exception of Tuvalu