Actually they are using everything they have to combat these cheap drones. That includes Patriot and THAAD systems as well. Specially UAE, which got struck with more drones than Israel. That is how Iran was able to take out a THAAD radar, because it was deployed so close to them.
You can’t really deduce THAAD was used against drones based on this. As the number of US assets in the Middle East increases, it is logical to deploy more THAAD to protect them from Iranian ballistic missiles. Israel intercepted a few[0] at the beginning of the current conflict, so it is common sense to presume there are still some remaining.
[0] https://x.com/Osinttechnical/status/2035762512147128344