I have read that blog entry and some of its references. The evidence provided for this strong claim seems to be very weak. I would not judge anything based on the listed talking points. Now, knowthing is impossible and such services are sure in the interest of governments around the world. I also want to remind people on the Swiss Crypto AG which sold compromised analog encryption machines for decades.

Mull with Adblock plus, Ghostery and Decentral eyes. Btw. I hope they soon update their icon to be Material theme compatible.