Very misleading. Berkshire Hathaway paid $8 billion in taxes. When you buy and sell stocks there is a capital gain tax that must be paid, so every person who owns the stock paid a portion of this tax, but in total it was $8 billion.
Amazon.com paid $2.1 billion in the US, they pay taxes in other countries as well.
Now Tesla did not pay any tax on income of $96 billion in 2018. Why? I don't know but I suspect they bought a whole lot of equipment that they were able to write off for depreciation. That law is favorable to domestic manufacturing and encourages companies to invest in new equipment. So even though they did not pay taxes you should also look at all their suppliers. Did they pay taxes? Also Tesla employs 121,000 people, did they pay taxes?
I am all for billionaires paying their fair share, but the word fair means everyone is treated the same. If Warren Buffet is trying to minimize the tax burden on his fund that benefits everyone investing in his fund fairly. He has long term investments so when he sells he gets the lower long term capital gains tax, and only when he sells. These laws encourage investors to invest. That is why capitalism works because money flows quickly to reward the winners and punish the losers. All that money they invest is being used by businesses to employ others and to keep their businesses competing with the rest of the world.
Ask yourself what "loophole" are these billionaires using to lower their tax rate? The write offs they have are available to everyone. Most of them do not take a salary which would be taxed at a higher rate, they profit when the stock goes up. As a rule investors want the CEO to profit when the stock goes up and to lose when the stock goes down.
One way they can cut their taxes is by taking a capital loss on a stock trade and carrying that forward to the next year. By law you can carry forward capital losses indefinitely. Perhaps they took big losses in 2008 and 2015 that they are still carrying forward. Again, this is fair, all investors get to do this.
Do not try to twist this as a defense of billionaires. I have no idea what their tax return looked like, or how they are able to pay such low taxes. What I do know is that simply looking at this one number does not fairly tell us anything.