https://www.cnbc.com/2019/04/25/amazons-advertising-sales-growth-slowed-dramatically-in-q1.html

One of Amazon's most promising new business areas, advertising sales, appears to be slowing down.

The growth of Amazon's "Other" segment, which consists primarily of advertising sales, slowed dramatically to 36% in the first quarter from the previous year, at $2.72 billion. That's a big slowdown from 97% year-over-year growth last quarter, and over 100% growth for three consecutive quarters before that.