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.
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.