I usually yawn my way through the big brother/paranoia articles but this shocked me.
And it is from a BBC news report called How Bezos built his data machine
The author used a freedom of information request for all that Amazon have on him...
"One spreadsheet actually triggers a warning message saying it is too big for my software to handle. It contains details of the 83,657 Kindle interactions I’ve had since 2018, including the exact time of day for each tap. An associated document divides up my reading sessions for each e-book, timing each to the millisecond."
https://www.bbc.co.uk/news/extra/CLQYZENMBI/amazon-data