"ban personal messaging apps at work" What does that even mean? I doubt you can forbid the usage of personal messaging apps except in very exceptional cases (like a court room). On the other hand: Using personal messaging apps for work related information is a no-go anyway because of confidentiality agreements basically everyone signs.
- Ban ANY use of your personal chats / device at work (eg. your wife texts you to bring milk on the way home)
- Ban WORK communication (eg. My colleague don't understand recent commit I've made)
So the web really isn't explaining how things enforced or what is being done. I do know of some industries where you put your personal phone when entering specific locations or having stickers on cameras) but here I didn't fully understood the scope.