I mean... For real, I've never heard of Linux systems being hacked this way. I'm sure it's possible, but it certainly seems rarer.
Slipping shit in upstream also certainly doesn't happen "that* often. It takes effort to become recognised enough as a developer to be allowed access to the upstream code, meaning you can't automate those kinds of attacks. (I imagine. Correct me if I'm wrong.)
I did not like this and quit after ten questions 😅
But I respect that it exists.