[Quoth]

Privacy is a right, not something a company decides on.
How secure is the data?
Who are they selling it to?

Some countries you can be arrested or lynched or legally sentenced to death for what you read.

Some companies it may hinder promotion or get you "pushed out" if they disagree with what you read.

Or it might mean you can't adopt, or don't get interviewed for a job, or get put on a secret watch list.

If you buy a physical book, CD, DVD etc with cash you're anonymous. The monetisation of personal data via epurchases, credit card & loyalty card data to Google etc is immoral and dangerous. In some countries and even now in California, some aspects are illegal.

Obviously many people don't care, or won't till it's too late.

Note to Tech Companies: Dystopian fictions are NOT blueprints, they were warnings.

I do not use "Pocket". That is too much extra information on me. If I want web pages on my ereader I copy and paste from a browser with all kinds of scripts & tracking blocked into LibreOffice, Save As Doc and export as DocX. Then Calibre.
I lived in a more dangerous country I'd use anonymous Internet access for anything other than the State Media.