The million dollar question to many Palestinians, I'd wager.
A movement is a permanent revolution. A revolution is not a state, nor is it a form of government. It can eventually settle and become a state, while still calling itself a revolution, as the Cuban revolution or Iranian revolution unfortunately did, but that only happens when it crystalizes into a non-revolutionary and stable form, having eliminated all internal enemies. Some movements never crystalize and require permanent enemies (Nazism, Stalinism). These resemble dictatorships and clothe themselves in state functions, but they do not demolish the basic structural aspects of the state. They keep them for appearances. What's left of the state itself operates below the movement and seeks whatever level of normalcy is possible through bureaucracy, just as the movement seeks legitimacy by cloaking itself with the state. i.e. the German state was a hostage of the Nazis. Some plain old despotisms even seek to impersonate revolutions (Gaddafi's little green book, the Kim family mafia). But the Taliban is much closer to the Khmer Rouge, or ISIS. Controlling the economic output of a territory doesn't make a movement a state, much as they may wish it so. At most, the Taliban are a mafia dressed up as a totalitarian movement which controls territory. When they controlled 90% of Afghanistan, there was no Afghan state.
And, FTR, I don't believe that all states are themselves unethical. What I've said is that ethicality is neither necessary nor sufficient for statehood, at least in the "classic" Western political theory definition of the state.
Per TFA, the Taliban's GDP is already over 25% of Afghanistan's. At what point do we drop the normative pretense and recognize that they're more of a state than they were when we started bombing them 20 years ago?