Kinda depends on the crowd tbh. If they’re used to being fed and they see you eating they might come over and request - s n a k - or at least loiter around when you’re gone. I started feeding this lot about 3 years ago during the lockdown when the park was very busy. They weren’t used to being fed so it took a few months for them to know who I was, and to ratify my track record of not eating anyone. Once they get to know you, other local crows tend to be more trusting. I think they discuss it with one another. Also you get to hear lots of cool ‘woo’ sounds if you feed them in winter and the whole flock turns up.