That's one interpretation, and one that the lawyers would like us to buy into.
Another is that this is simply morally wrong, and we shouldn't accept that simply being salaried implies that all intellectual work you do is owned by the employer.
This is a matter of convention, expectation, and interpretation, not rules. Powerful corporations are fighting for the interpretation that most benefits them at the cost of those who are weaker. That's not crazy; it's wrong.
Another is that this is simply morally wrong, and we shouldn't accept that simply being salaried implies that all intellectual work you do is owned by the employer.
This is a matter of convention, expectation, and interpretation, not rules. Powerful corporations are fighting for the interpretation that most benefits them at the cost of those who are weaker. That's not crazy; it's wrong.