Apple is a publicly traded company which makes consumer electronics. The have investors to pay a dividend back to. It would be a dumb move to switch target to the space sector, which requires a much different company and talent pool. Frankly it would probably be easier, and more sensible to start a company from scratch.

If you wonder why all of the shareholders of Apple aren't plowing their money into spaceflight, well it's probably because they're a retirement fund, or just aren't rich.

Other people invest in making this world a better place, see Bill Gates, or other worthwhile causes, of which spaceflight is just one.