I can't get past Apple going into a hyperinflationary cycle (e.g. debasement or default are the only remaining levers the government has and both lead to rapid

I can't get past Apple going into a hyperinflationary cycle (e.g. debasement or default are the only remaining levers the government has and both lead to rapid inflation) with hundreds of billions of cash on hand. Is there really literally no investment opportunities? It's hard to understand. If returns diminish that much, why not just accelerate buy backs 10x and become a smaller company?