Read the Pocket and Mozilla FakeSpot privacy policies. They collect a lot if data, including browsing history, and do so via Google Analytics. They then share that data with advertisers.

We also share aggregated, non-personal data and related usage information, which does not contain any personal information which can identify you or any other individual user, with third parties, including content providers, website operators, advertisers and publishers.

https://getpocket.com/privacy#sharing

From the pocket privacy policy

… and they’re tracking your searches, collecting massive amounts of telemetry, and using pocket that collects and sells your data.

BaSeD

Still good to have, but too bad they couldn’t just piggy back off of Brave’s soft fork or something and keep the functionality.