Why? Like seriously - grade them on their work and tests and who cares what they do else wise
That being said, it’s only acceptable IMO when:
1. It’s only on school-issued equipment.
2. It’s only during hours when the school is responsible for the pupil.
3. What’s being monitored and recorded is stated explicitly in and limited to a document that is distributed to students and parents when the equipment is issued.
4. When screen grabbers or Remote Desktop are used, the student is given some kind of obvious on-screen warning that they are being surveiled in real time.