Do you trust Microsoft? If you do I might suggest we find you a nice quiet padded room.

Imagine someone attempted to (or even succeeded in) pushing malicious (or even just poor, "bad" code into the kernel. What do you suppose would happen? Oh wait we don't have to imagine. Some people tried, and got admonished publicly.
https://www.theverge.com/2021/4/30/22410164/linux-kernel-university-of-minnesota-banned-open-source