Yeah, I'm sure these "schools and universities" just used nulled versions insteadWhat about free licenses for schools and universities? Most of them can't buy license and use nulled version.
MyBB isn't all that insecure, and you can find decent styles for it.free alternatives so ugly and they have a lot of security vulnerabilities.
A lot of schools have communities setup for their students, though it is usually done by the teachers.
Why not use MyBB? SMF? phpBB?