That's fascinating. I just checked my contract and it doesn't mention working hours at all.

However, I'm not in tech, and prior to COVID, it physically wouldn't be possible to work multiple jobs remotely. So perhaps this is an artifact of that time.

Some of the other comments suggested there may be actual laws against it, I'll have to look into that.

Off-topic, but I discovered that recent legislation made my wage confidentiality clause illegal.