We have quite a few birds around our house and it has been quite gratifying to see how much they accept your presence after a while. While making coffee yesterday morning, there were three tauhau hopping around in the tree outside the window, less than a meter away, unconcerned. If I go outside they'll keep to about 2 meters. When I'm working in the garage, a piwakawaka often comes in to watch me. If I'm digging in the garden there are a few (I'm going to guess starlings) that watch me digging in the garden close enough I'm surprised they don't land on me. As soon as I stop digging, they're in the dirt rummaging for what I might have turned up. Collectively they have all decided that I'm not out to get them so just go about their business. Except for the piwakawaka, which does seem to go out of its way to just watch me make things.

It possibly helps that I have a dog that will not tolerate a cat on the property and seems to believe that birds don't exist.

Crows can remember a dangerous person and tell their friends about it. From "Social learning spreads knowledge about dangerous humans among American crows" (https://faculty.washington.edu/wirsinga/Cornell2011.pdf)

We exposed wild crows to a novel ‘dangerous face’ by wearing a unique mask as we trapped, banded and released 7 –15 birds at five study sites near Seattle, WA, USA. An immediate scolding response to the dangerous mask after trapping by previously captured crows demonstrates individual learning, while an immediate response by crows that were not captured probably represents conditioning to the trapping scene by the mob of birds that assembled during the capture. Later recognition of dangerous masks by lone crows that were never captured is consistent with horizontal social learning. Independent scolding by young crows, whose parents had conditioned them to scold the dangerous mask, demonstrates vertical social learning.

I don't know the answer, generally speaking, but we've got a pair that pop onto the back fence every morning waiting for their peanuts. I think they're multigenerational, as I have reasons to suspect that the "original" Mr. Peanut has passed on. Anyway, the bold one will come sit with me in the front yard. When I walk the dog, they'll follow me for a bit, flying a few feet off the ground right in front of me, I assume to make their presence known and get a piece of dog biscuit (which I oblige). They have never gotten obnoxious about it by crowing at me, just silently hanging around: "if you could spare a bit of dog food, kind sir..."

Friends? It's probably transactional from the crow's POV, but OTOH they hang out on the fence and just sit sometimes even if there are peanuts on the ground. I enjoy seeing them, though. I will say, though, that after many pounds of peanuts not a single one of the little bastards has ever brought me a present, as is advertised. :-)

A friend is someone you’ll spend time around given other options. If you’ve spent any time getting to know crows (or jays, or any other corvids), it’s quite obvious this is the case. I had a scrub jay who’d perch on my foot while I read in the morning. I considered him a friend, and by that standard, he me.

A murder of crows lives about 200 m away and whenever a predatory bird enters their perimeter, they swarm it until vacates the area. Everything from osprey, hawks, vultures, and eagles, they leave Great Blue Herons alone though.

I don't want to go out of my way to befriend them, because they may harass people who are not me on the property.

They are, until a murder takes up residency in a tree outside your apartment in Emeryvile. Then they are cool roommates you have to get away from else you lose your sanity.

The crows around my house are generally cool unless I do something they don't like and then they'll remember my face for all of eternity and mob me whenever I am outside.

We have problems here with crows destroying lawns to dig up grubs.

A local sod farmer told me they shoot one and leave it dead in the field. All the other crows show up for a crow funeral and when they leave they dont come back. They remember the crow that died there and treat the area as dangerous.

In Australia, they attack random people.

I mean; they cause no harm unless you are a farmer or something, do they?

Yes.