what's your take on employers banning the use of languages other than English between coworkers at the workplace?

https://linux.community/post/3497785

I was always told it’s a bit rude to use a language that not everyone present understands, since you’re basically excluding people from the conversation. Your example seems a bit silly though.
Talking to a person excludes all others by default. If I’m talking to you I’m not talking to the guy behind me. What does the guy behind me care what language we’re using? And why should I care about the one I’m NOT talking to.

Hallway chat is the reason people come to the office.

It’s impossible to take part if people use a language you don’t know.

People go to work to make a living.