iterally DDG'ing "tla industry" gets you stuff eg. https://en.wikipedia.org/wiki/TLA%2B#Industry_use.
Another 20 seconds gets you https://lamport.azurewebsites.net/tla/industrial-use.html
Another 20 seconds gets you https://lamport.azurewebsites.net/tla/industrial-use.html
At least personally, working at a small and understaffed startup, I'm not always going to find the time to put together big case studies on interesting things I do, but it's a lot easier to share a sentence or two on a casual Hacker News thread. I wouldn't be surprised if it's the same for other people.