Edit: the deleted comment was talking about how this has legal compliance implications, effectively that companies have to do this.

Thank you for highlighting this, I was struggling myself on how to word a message like this.

I work tech in a heavily regulated type of business, and have been neck deep in work on things with legal compliance considerations lately.

The issue with your “corporate snap chat” idea is that it would inevitably be used to share information relevant to potential legal proceedings.

Any space like that needs to be out of the business’s control and view to provide a legal air gap for any responsibility. Businesses would prefer their employees do that shit where they can safely argue no control or responsibility over it.