A statement in a blog that only a tiny percentage of users will read is not at all transparent.
Do users who receive browsers with Cliqz get a clear, effective opt-out warning? Really, it should be opt-in but that doesn't appear to be the case:
The users will receive a version of Firefox with Cliqz recommendations enabled out of the box.
https://blog.mozilla.org/press-uk/2017/10/06/testing-cliqz-i...