I've boarded at five or six places in my time, and they were all different.
My first horse was at one place with full board, save that I cleaned 12 stalls once a week for part of my board. They were supposed to provide water, food, shavings, & turnout. There was a period were the BO was really broke and couldn't afford shavings, so my sister and I bought them for our own horses for two or three weeks running. I arrived early one morning to find her and that days helper shoveling shavings out of our stalls and into other stalls.
I said, "We bought those!" and the BO got quite mad at me , said the other horses were needy (which was true) and that we were being selfish.
Another time she got mad, which I found odd, wasn't at me, but at another boarder. The BO was late feeding, and this girl arrived at a normal time to go riding, but the horses hadn't been fed. So, she sat around and waited. She didn't get angry or anything, just waited.
But the BO was furious! "Imagine!" she said, "She just sat there, doing nothing! Wouldn't you have fed the horses?" But I wouldn't have, because they all got different feeds, different supplements, and I wouldn't have known what to give them. Also, there may have been a reason, unknown to me, that explained why not, like a vet coming or something. So I found that odd, especially how angry the BO was.