The Sunbeam blanket is a Tuya device that works with Local Tuya with a little fiddling. I do wish it was Matter instead but… In any case it works. Locally.
Blankets and anything with heaters are hard to do. Commercially they require a LOT of safety features so you’re asking for someone to certify that thier device won’t cause a fire… …now we add… In case it’s accidentally activated, and left on… And.
Most electronics manufacturers don’t want that liability. The Sunbeam is the only one I know of in the Northamerican market. I personally wouldn’t automate a dumb blanket because of aforementioned safety concerns.