Invent a time machine. Go back in time. Study.

Failing that, learn from your mistakes, and next time… well… study.

Is it by a for-profit company, in year 3190 of our lady Discord?

Then nope, it is not.*

(* some exceptions may apply, not in this case though)

My Emacs needed a bootloader.

I have Emacs, and I have my NixOS configuration. That’s all the GUI system configuration I need.

Lie to myself, and chug another cup of coffee.

In our kids’ elementary school, the rule at the start of year was that kids tell the teacher they have to go, then they simply go. Notifying the teacher is mandatory, 'cos they are responsible for the kids, they need to know where they are.

This was slightly changed since, because of bullies. While the vast majority of kids can go to the bathroom whenever they want, bullies don’t: they can only go alone, or supervised. So if there’s anyone else out, from any class, they have to wait. If it is urgent, a teacher or another adult will go with them, and stand by the door, close enough to intervene if need be.

To add some nuance to the rest of the comments posted here: GPL’d code can be made proprietary, if the copyright holders all agree. For example, given a project that requires copyright assignment, if the project owner decides to take it proprietary, they can do that, because they’re the copyright owner. GPL alone is not enough to keep a codebase FLOSS. Luckily, both the kernel and git have hundreds of copyright owners (and does not require copyright assignment), so legally changing the license of either of them is practically impossible. So, really, Linus wouldn’t be able to take anything, code wise. He could take his future work, yeah, but he hasn’t been doing much development for the past decade.

Otherwise… He let go of git pretty early on, and it’s been maintained by Junio ever since. So nothing would happen there whatsoever, Linus’ retirement (friendly or otherwise) would be inconsequential for git.

The kernel has capable maintainers who have been maintaining stable trees for a long while now (often with companies backing them), and people who have been maintaining large subtrees. There’s a considerable overlap there, too. In short, there are a fair number of people who could fill in for Linus in a pinch. There’d be a small hiccup, and that’s about it. His skills and experience would be missed, but it wouldn’t cause any lasting harm.