Reading the comments here, I remember reading this article [1] about JPM traders using iMessage instead of official company comms. The scenario I see happening with WADU in mind is traders/employees know about this tracking and explicitly go outside of the bounds (ie use iMessage) so that WADU doesn't track them.

[1]: https://www.wsj.com/articles/jpmorgan-in-talks-to-pay-200-mi...