Blendle also tracks which articles you read. They also are working on an algorithm that picks the news for you, creating a filter bubble.

The filter will be opt-in, obviously.

And, again obviously, they need to keep track of which account is allowed access to which article. If only to allow you to read the article across multiple devices.

(Former employee here. Not in the exact loop these past 12 months)

If it takes fiat currency it's probably not anonymous.

We accepted bitcoins from day one. Not sure if they still do as it was used I think 8 times over the course of 2 years. But given the people working there I wouldn't be surprised if they still accept them.

(Disclaimer: Former employee. Left in sept 2015.)