Many client invoiced apps have some branding, like logo, phisycal address, etc.
Now, imagine I had managed to create an app that taps into my client's DataBase (in-house dedicated server), and my client is satisfied with my app... still he would like me to stream line and improve my apps overall performance... I read another user that asked about how to do jyst this using IA, feeding the whole project to it, and getting either a final improved version, either improvement suggestions... in this case, all client info would have been shared with the IA...
So, for me at least, this consists in a breach of NDA, or even worse, full client data breach.