I knew you'd retort with this exact example, because you're predictable.
No, I actually don't have the means to save everyone starving in Africa, or even a few. I don't have supply chain access, influence over foreign governments, or anything to directly aid anyone internationally. So I can give to charities, and do, but government corruption in poor nations ensures that the reach of those donations is limited and the cycle of poverty is ever perpetuated in order to maintain their existing power dynamics.
I also fully support foreign aid and am happy to pay my taxes to contribute to that.
I also am not wealthy. I'm not poor, but I have a hard cap on how much I can give to others before I'm hurting myself and my dependents, and that amount is nothing more than enough to keep a few people limping along for a little longer.
A billion-dollar company can reduce the cost of their absurdly priced medicines that would save millions, and still make insane profits. They just might not maintain perpetual growth.