[adetrest]

You can do work on the side without disclosing your employers trade secrets, I would hope. There is nothing mysterious about yet another CRUD web application. Besides, confidentiality is covered separately and an NDA can stand on its own.

I suspect employers love restricting your right to have a side hustle so that they absolutely totally own you. If you have no other means of income besides your job they can lean on you pretty hard and there isn't much you can do about it if you like having a roof over your head.