Sure. It's called DLP and if you pay them, you can have it warn you about your own specific regulations before you commit a share based on the content of the file. There are premade options for a lot of different country's regulations or you can roll your own.
I think we may be at cross purposes, because nothing you have written makes any sense to me. We might just be thinking of different things.
First of all, I wasn't talking about a situation where people use OneDrive to store their files. Was that what you meant by "You have to make stuff public on purpose in 365"?
Secondly, "of course they know what is visible" doesn't track. Microsoft isn't a person and I assume has internal silos. I also have not gone over all the user agreements with a fine-tooth comb, plus all of the privacy and other options configured in particular instances. I do not believe there is a general artificial intelligence in anything from MS that can manage the complete context, from firewalls to hackers.
Finally, in your follow-up comment, to which I'm directly replying, it sounds like you are talking about a specific configurable feature, whereas I was originally referring to default behavior and it obviously not being useful or intelligent.
