I really doubt there are regulations around this where you live. Recirculating vents are only going to grow more popular as they're now often built into your electric/induction hob.
Not leading away moisture from the kitchen when cooking doesn't sound like a good idea to me but I'm just a child of a craftsperson working with these kinds of things, not one myself. Except if you live in like a hut with a lot of openings or something, but I'm kind of assuming this is about apartments and houses with isolation and so on.