This reminds me of a bad experience I had back when I used to board my horse. My best friend and I love horses and spending time at the barn. We each boarded a horse there.
The barn owner worked late every day because that was the shift he worked at his day not. No problem, me and my best friend loved horses so much that we fed the horses each and every evening after we rode. Not just our horses, but every horse on the place. We got no discount for such, we just wanted to volunteer and get the horses fed earlier than they would have been otherwise.
So we kept finding mold issues in one particular stack of hay. Our personal horses were fed from this stack of hay and it worried us. So I wrote a note to the barn owner expressing my concern and tore off a smallish chunk of the moldy hay (maybe a 1/4 of a flake) and left the note with the hay sample on his doorstep. The note was not nasty or rude. My best friend's mom even proofed it for me.
Well, hell broke loose the next day because apparently the barn owner came home late a night and tracked hay in his house. Boy was he pissed. He didn't even want to talk to me, he went straight to my parents (I think I was 17 at the time.....still a minor but hardly a child). So it was a big deal apparently to the barn owner. There was nothing bad in my intent.....I just wanted to make sure the horses weren't being fed moldy hay!
So I probably stayed there another month until I found a new place to board and I moved. I didn't have to, but I didn't feel comfortable boarding there after that incident. I didn't even give notice. I found a place to board, packed my horse up and left without telling him. My best friend and her horse followed.
So yeah, no good deed goes unpunished. We were free farm labor for months (maybe longer, I don't remember how long I boarded there) and the barn owner didn't appreciate anything we did.