Modern Retail Rundown: H&M CEO out, TikTok expands Shop & Amazon’s ads business grows

First is a look at the sudden departure of H&M’s chief executive officer, who cited the demanding nature of the job. Next, TikTok is reportedly testing a video feature that shows users similar products sold in TikTok Shop — hinting at an increased focus on growing e-commerce. Finally, why Amazon’s advertising business continued to grow during the fourth quarter — surging 27% year-over-year, to $14.7 billion.