Ask HN: Should a 'no side projects' policy be taken seriously? 4 years ago
I had to deal with this recently. Apparently these are "standard templates".
I hired a lawyer to rewrite that section to have a clearly split for side stuff and the company's stuff as well as the other invention assignment sections. See github's for an example of a fair agreement https://github.com/github/balanced-employee-ip-agreement). The company accepted it and everyone was happy.
If the company doesn't accept that they have no business taking ownership of completely unrelated stuff you do outside of work hours find another company to work for, they clearly don't care about you as a person.