And I’m pretty happy that students use nowadays google docs. Sure, it’s propiertary and can break at any point, but man if it does not make collaboration easier.
So: total reliance on someone giving something away for free that could break or be taken away at any time and you have no privacy- that’s ok, even if they’re not going to hire you later?
At any time, you can download your google docs data and have it locally. You can convert it to word/excel formats.
This makes anything you are trying to argue completely irrelevant.
If they basically forced you to keep your data in their proprietary format online-only, then maybe you have an argument.. but since this is not true you are grasping at straws here.