What you're talking about here is trying to negotiate with someone who is trying to make it very clear from the start that they don't want to be fair. Unless you are paying lawyers 50k+ to help you, well you can waste your time but in the end it probably won't matter all that much.
Sure, and I have stayed away from FAANG (MAMAA now?) for 15 years because of that. The position/work is such that I am interested in what my options are beyond the "Why bother" stance that I have held until this point.
Edit: I appreciate a response regardless. If I get an overwhelming amount of apathy in these responses that might just be a sign I should change my mind about the position.
I understand that. You need to get your lawyers and their lawyers to come together then to draft a contract and have enough money ready to fight something if they breach on their end. That in itself is usually enough to avoid it.
If you want to proceed, remember you are dealing with people that don't care about being fair. You may have the mindset, hey I want to make this more fair for myself. They will have a mindset of, what can we do to make this person think this is fair but still exploit them to the fullest potential and make sure we are protected to the fullest extent possible.