Between this and certificate transparency logs, it seems insane to me that the commonly advised Correct Setup, to be able to experiment and hack random little personal stuff, and have it reliably work on modern browsers, requires you to 1) buy a subscription (domain), 2) enter into another subscription-ish contractual relationship (Let's Encrypt), and 3) announce to the whole world what you're doing (possibly in two places!).
Imagine your computer stops booting up because you repositioned your desk, and everyone tells you the Correct Way to do it is to file a form with the post office, and apply for a free building permit from the local council. That's how this feels.