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I think this was discussed before, but there's no way to inherit a companion object, right?
For instance, I need that every `Model` class have a `Factory` for it

i've wanted this exact same behavior.  you can have a companion implement an interface, but i don't think you can enforce that a class has a companion object which implements an interface

there's no such thing as an abstract companion object hahaha

there's some discussion on it here: <https://discuss.kotlinlang.org/t/a-way-to-enforce-static-properties-in-sub-classes/11777/24>

i wanted the same thing you do: to enforce sub classes of a type all have a factory method for creating them