"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.
At least for the financial institutions on this list, I can say they have no other choice. Regulation forces them to log everything to avoid insider trading, etc. Any communication outside of their internal systems can't be logged and is therefore a compliance risk.
I don't understand why they put this up like it's working in their favor. Their website doesn't explain anything extraordinary that makes them different from the average chat app, except that it is europe based.
Meanwhile in Spain I use WhatsApp to contact the municipality, the GP uses it to send my blood results and package delivery drivers ask me to share my location. I hate it.
[dead]
TLDR: yes, governments in favor of Chat Control legislation want to make absolutely sure it doesn't apply to them.
Of course, the consequence is you end up communicating for work on something like Teams instead of an usable chat app.