When I moved to Maine in 2001, an older (than me) couple lived across the street, and another couple, close to my age lived adjacent to me to the south, while the house to the north was vacant. In the winter, if I didn't get up early enough, either one of these people would have shoveled or snow-blowed my driveway and sidewalk before I got up after a storm. My tendency was to go to bed late and get up late, so I had to make a point of getting up earlier than them once in a while so that I could reciprocate. We would spend a week at a time at a couple of timeshares that we have during the winter, and wouldn't have to worry about having to shovel our way into the driveway and house when we returned.
It became normal for whoever got up first to take care of their own sidewalks, driveway, or lawn (in the summer), and then move on to the neighbor's if they weren't already working on it.
However, the man to the south of me moved to an apartment after his wife died, and that house has been vacant since, and the man across the street died, a few years after his wife died.
Someone moved into the vacant house to the north of us. Apparently, he didn't have a lawnmower when he moved in, and honestly, it didn't make sense for him to buy one because his front yard was tiny and he doesn't have a backyard, After mowing my yard, I moved on to mow his, as it had already been long when he moved in. He seemed to have taken offense over that, insisted on paying me $30 for what was, at most, a three-minute job, and I haven't exchanged a word with him since, and it's been about six years now, although his wife seems friendly enough.
Across the street, my neighbor's son moved into what had been his father's house, and he's a bit strange. He yells at people he's never met before, including my wife, who had never spoken to him before. He's been trespassed from the post office and at least a few businesses in town, so, while I have made a couple of overtures toward a conversation with him while walking past his house, I don't think we'll reach a point of neighborliness on that point.