Does that make high school a daycare? I don't get it. At age 15 I had curfew, but could generally come and go as I pleased. At age 17 I was at times left alone

Does that make high school a daycare? I don't get it. At age 15 I had curfew, but could generally come and go as I pleased. At age 17 I was at times left alone at home for a few nights. This was all normal in my teenage years in my corner of the world. Why would high school need to function as a daycare? The teachers would definitely rather not have to deal with this on top of the usual responsibilities.