A "license" is a permit from the government to do or use something, and carries the implication that it's something that can be denied.
I know it 100% functions as a tax and not in any sense as a license. And the idea of requiring government permission to have a TV carries less weight in the internet age than it would have in the past. But the wording alone still makes my blood boil. It sounds like something you'd find in North Korea.