Making it harder for alternative OSes to use their hardware without accidentally damaging it, further cementing macOS' position as the only OS to be trusted.
It's similar to their war against third-party repair shops by deliberately making it difficult to replace parts, even with genuine ones --- see my second link about the iPhone 12 camera.
This is the automotive equivalent of adding sensors and ECU firmware that detects if the engine is using the manufacturer's proprietary oil, and subtly changing the parameters to decrease power and fuel economy, increase emissions, and/or shorten the life of the engine if it isn't. Then blaming third-party repair shops when customers complain.