system
A chat on subreddit /r/pcmasterrace
human
Emails from vendor, dated Dec 20th: "Oh these tools you're using are making deprecated API calls. They're gonna stop working Jan 1st"

Not like those tools were mission critical or anything.. oh wait they were.
gpt
Something similar happened to us a few years back. Our legal team sent them a very nice letter explaining how they would be in breech of contract.

We eventually switched over by the end of January.