This is jumping into the realm of bioethics. Google or a billionaire would be ethically obligated to share any beneficial solution for immortality, but they're not technically obligated to do so.
One hope is that finding effective solution for aging and death will require so much time and manpower that partial solutions will end up being known and shared, even if heads of the program would want things to be secret for some reason. So I don't think we should fear Google turning into Ilaria.
