#2
You forgot the timer.
Fridges used to use mechanical timers to control the defrost cycle. Building those to work well is expensive. Nobody does that any more, they're very cheaply built in China, and they don't last long.
So what replaces those is an electronic timer with solid state power control circuitry and a microprocessor, because it's cheap and reliable. Guess what a microprocessor needs? That's right, firmware.
So my 35 year old fridge has firmware in it now. It's never getting updated, but it's there. The electronic timer replaced 4 attempts at getting a mechanical timer to reliably fix it when the original timer failed after 25 years.
So yes, fridges need firmware. They almost certainly don't need firmware updates unless somebody has done something stupid like getting one with WiFi.
(Ok, so networking makes sense if you've got a food service business and you need to be able to monitor the temp in a dozen or more fridges so you can dispatch service and move food if something isn't right, you're better off finding a problem before the health inspector does. You don't need it at your house. And don't get me started on those stupid fridges with screens for what's essentially a big Android tablet on the front.)
I understand that Ukraine responded by sanctioning the export port and more refineries.