This is the issue with a tool so powerful, you can't just tell people not to use it, or to use it responsibly. Because there's too much incentive for them to use it. If it saves hours of a persons' workday, and they're not seeing any of the harm caused from data leakage, there's no incentive for them to not use it. Which is why a private option is so critical. To not fight against human nature, means providing an abi…
2.) Of course, you can tell people not to use it. Unlike people at SV companies apparently, people in government and government contractors accept restrictions like not having phones in secure labs all the time. Start firing or even prosecuting people and people will discover very quickly they don't really need some tool.
And, yes, private versions of this sort of thing helps a lot.