That assumes the US won't fight back. US contributes ~6% of Yemen GDP in foreign aid. Yemen is a big food importer. US could shut off foreign aid and blockade Yemen and collapse their economy - they wouldn't be able to afford food, let alone 20k drones.
The Houthi strategy isn't an economic strategy, it's a "hope the US isn't willing to kill us" strategy.
The Houthi strategy isn't an economic strategy, it's a "hope the US isn't willing to kill us" strategy.