> That points to a glaring hole in the modern-day automated web PKI, not Tesla's dangling DNS record.
It's not. They control a long-term high-value asset (the domain tesla.com). They decided to delegate part of that asset to a large number of "random" people that they do not have a contract or agreement with.
Being able to issue certs for cloud IPs has nothing to do with this since it is not a long term asset, and if it is you probably don't delegate it to random people to control unless you do not value that asset.
This is why IP certificates are limited to a max lifetime of 6 days.
> IP address certificates allow server operators to authenticate TLS connections to IP addresses rather than domain names. Let’s Encrypt supports both IPv4 and IPv6. IP address certificates must be short-lived certificates, a decision we made because IP addresses are more transient than domain names, so validating more frequently is important.
Maybe running a web server on the same IP as an NTP server is a bad idea.