It's true. There are more Windows desktops used in enterprise environments and households than linux and there are so many insane design choices like making the taskbar clock slider thing be written in react. How many useless clocks does that waste? That is a very easy optimization that can be remediated instead of being lazy and waiting for the next node from Intel or AMD.
Computers use up extremely small amounts of electricity. Most people don't actually know this. Your washing machine is a good ~100 computers. A lightbulb? If it's not LED, that's a few computers. For one lightbulb.
Of course it depends on the computer, but if we're talking laptops or corpo computers it's like 25 - 50 watts. Supercomputers, like those used for AI, are different of course.
