Primarily these types of software's are used for safeguarding purposes. For alerting teaching staff about children who are being abused, bullied or at risk of self harm etc.
I think a better lesson would be here that if you use an account that's not managed by you, it may be used to install software that you disagree with. This is a good lesson for using IT in the workplace. OP shouldn't expect his son's school provided account to maintain privacy when he's using it, because schools have statutory responsibilities to look after the safety of their students.
I think a better lesson would be here that if you use an account that's not managed by you, it may be used to install software that you disagree with. This is a good lesson for using IT in the workplace. OP shouldn't expect his son's school provided account to maintain privacy when he's using it, because schools have statutory responsibilities to look after the safety of their students.