Most appliances have fairly general-purpose microcontrollers inside them, but expose a fixed-function interface. Hopefully things like safety interlocks for microwave oven doors are implemented in hardware rather than software.
> Soon they'll come for our general-purpose computing with "features" for DRM.
You... haven't noticed all of the existing DRM features?
Not on my computer. I'm worried that there's a chance that someday general-purpose computing hardware will be locked down to the same degree that mobile or console hardware is today.