That number only includes sales of music online in the US. If you add in global sales, CDs, concert attendance, etc. then you get a far larger number.

At no point is that number "almost nothing" though. Hundreds of billions of dollars is more than enough to finance the global music industry and provide a generous living for all of the world's musicians.

Wikipedia has physical music sales in the top 20 countries at a mere 12 Billion total. Where are you getting your numbers? I am not seeing any numbers anywhere that would suggest anything near plural hundreds.

Also note that you are comparing an entire industry to individual technical companies.