For me it was the other way around. The expensive school computer was locked down (this was the mid-1980s) but I learned stuff there that I then explored at hom

For me it was the other way around. The expensive school computer was locked down (this was the mid-1980s) but I learned stuff there that I then explored at home on a home computer. People tried to get into the school computer to capture other people's passwords, so it wasn't a "messing with school computers to make them do new things" as much as a "messing with school computers to prevent other kids from learning anything". I'm glad they were locked down. But I'm also glad my home computer was completely open (Commodore 64, TRS-80, IBM PC) and relatively simple to experiment with. Maybe a Raspberry Pi serves that purpose today but it's so much harder to spend the time to learn that when there's a shiny ipad next to it.