At first I thought you were joking, but then I realized that's actually a really good question.

It'd be interesting to see a breakdown that took the top 1% of successively smaller chunks until we see just how small we can get until the chart starts to flatten out. But then again, maybe the author has already done that and just didn't feel it was important to mention. Maybe 0.01% is the point at which the disparity stops being so gigantic. E.g. the difference between the 0.001% and the 0.01% is not nearly as stark as the difference between the 0.01% and the 0.1% like we see on that second chart.