On 2023-Dec-31, Keybase had an outage because a TLS certificate expired. Expired TLS outages have happened at GitHub, Oculus/Meta, Microsoft Teams, and Vim. It doesn't seem to matter if you're a large organisation or an Open Source project. Expired TLS certs keep causing outages. I've even seen automated renewal systems fail from time to time. Failure modes Getting a TLS cert is cheap and easy with LetsEncrypt. Even better, they offer a battle-tested automatic renewal tool, certbot. Unfortuna...
