this is p interesting, about nintendo using ejabberd for their switch server stuff and everything they had to do to make it work with ~34m clients https://blog.process-one.net/ejabberd-nintendo-switch-npns/
In the US, legal case names in federal civil forfeitures are formulated thus: "United States v. <item being seized>".
This leads to some entertaining case titles. Particularly well-known are "United States v. Approximately 64,695 Pounds of Shark Fins" and "United States v. Article Consisting of 50,000 Cardboard Boxes More or Less, Each Containing One Pair of Clacker Balls".
OK, I have no words for this: https://github.com/systemd/systemd/issues/6237
If your username doesn't match what Poettering expects usernames to be (and doesn't seem to be documented anywhere, but `[a-zA-Z]+` is *probably* safe?), then systemd will happily run your user services as root.
Reply: not-a-bug, don't use “invalid usernames”...