“The first thing I learned is that Amazon is in no hurry to give you your data, nor does it really encourage you to ask for it in the first place.”
The request page took a search engine to find. The data took about 19 days, against the 1.5-day median Amazon reports to California regulators. It arrived as 74 separate zip files to download one at a time. Amazon can ship a toaster overnight. It makes handing back your own data slow on purpose.