Me being in Germany and clearly not a lawyer. That said: I own all my intellectual property, of everything I develop in my free time on this device. And in Germany, at least as far as I am aware, these broad regulations some US employers try to force on their employees have been thrown out by court decisions. But not sure on that.
I would not work for a company that would try to ensure it owns all of what I do outside of company time.
I would not work for a company that would try to ensure it owns all of what I do outside of company time.