I get these are jokes but I really don't find anything funny about it, it becomes a meme and then people start getting more creative and pushing it more and being more covert and people come up with other little japes then new Linux users get their shit destroyed and maybe important info gets lost or precious memories so they say Linux is a piece of shit and go back to windows.
It's not even funny to start with so when it inevitably inspires people to be assholes and bullies that's all we've achieved.
Careful, you have to also add --no-preserve-root to make sure you get all of it out. If you leave the roots, it'll just grow back later!
(But seriously, don't actually do this unless you're prepared to lose data and potentially even brick your computer. Don't even try it on a VM or a computer you're planning to wipe anyway, because if something is mounted that you don't expect, you'll wipe that too. On older Linux kernels, EFI variables were mounted as writable, so running rm -rf /could actually brick your computer. This shouldn't still be the case, but I wouldn't test it, myself.)