It does take a commitment because they have good memories so if they get used to you feeding them, they'll continue to expect it and they train their younger generations to recognize you. That means having consistent sources of food for them and feeling guilty when you forget to bring crow treats with you when you're outside. They might also start to follow anyone who they see you with, expecting that they too will have treats.

That said, it's great to have crow friends. They follow me around the neighborhood and at work. It makes me feel like a druid with animal familiars. I've had crows swoop and squawk at a dog that was barking at me and my dog. The crows left me a stone in the bird bath that they use in my yard.