It’s a Slack workspace setting that you’ll see when you go through them, Shannon.
I’d just say something like, “This hasn’t come up until now, so it’s not an issue and we’re changing settings in the workspace to allow only certain people to use the feature moving forward.”
No punishment for the member who used it
Update settings and comms on the change to also reflect the growth of the community and folks being more mindful of notifications for thousands of people in the community or something like that 🤷♂️