Comment by pixl97

>a lot of companies that have billions in cash

They sit on billions because they avoid spending their money as much as possible.

The amount they spend on RAM in surrounding few years would represent almost nothing to the massive money hole that would happen if they tried to make their own fab.

Also, these problems tend to affect the entire market, which means if you're big, you're fine. It's when problems don't affect your competitors but affect you that the real issues for these companies crop up.