Again that’s a terrible analogy. ISIS was an international insurgency that went so far as to explicitly reject the very concept of modern day nation states. Of course they didn’t deserve to be treated as a sovereign power.

Conversely Ansar Allah is a domestic organization. It’s commonly referred to as the Houthi movement because it has many leaders who are Houthis, a Yemeni tribe. They rose to power after the previous Yemeni government faced a crisis of legitimacy during the Arab spring.