If Apple doesn't expect to achieve a satisfactory return on investment they shouldn't enter a new business area, regardless of their liquid assets ('money reserves').
If expected ROI is too low they should return the money to investors (share buyback or dividends) and let investors choose a different investment with better prospects by themselves.
If expected ROI is too low they should return the money to investors (share buyback or dividends) and let investors choose a different investment with better prospects by themselves.