I get that. I was pointing out dumb contract clauses in general. As the OP says, there's a large array of these types of things found in contracts, which is why I brought up overly restrictive non-competes and arbitration clauses, both of which are just as scummy as claiming ownership of any IP during the period of employment.

But non competes are hard to enforce whereas having releted work/ip belongs to the employer is prity much custom and practice.

The employee employer relsionship is very one sided