Earlier quoted context omitted.
"[Amazon] has captured 43 percent of all internet retail sales in the United States, with half of all online shopping searches starting on Amazon. In 2016, it had over $63 billion in revenue from online sales in the United States — or more than the next 10 top online retailers combined. It controls 74 percent of e-book sales, is the largest seller of clothes online and is set to soon become the biggest apparel retail…
Exactly, so, not a monopoly in ecommerce. And only a single-digit share of commerce . And, of course, there is literally nothing inherently illegal (in the US, at least) about building a monopoly in any case.
This is not true, despite being repeated extremely often. See https://en.wikipedia.org/wiki/United_States_v._Alcoa