One's employer is unlikely to be so forthright with their future plans. It should not be misleading to reveal only the minimum information necessary to a potentially hostile actor (speaking culturally, not legally).
> It should not be misleading to reveal only the minimum information necessary to a potentially hostile actor
I have no problem with this. But I see a big difference between asking one's employer "If I was already working on a project in my free time and wanted to take it further, what would I do?" and "I haven't started working on anything yet, but if I wanted to, what do I do?", when one has indeed started something already.