Concerning the OPSWAT article I gleaned this from their "introduction…

OPSWAT releases periodic market share reports for several sectors of the security industry. This report includes worldwide market share for antivirus, public file sharing (peer-to-peer), backup, and antiphishing applications. The data used in this report was collected on August 13, 2013. Please note that OPSWAT is not a research institution, and makes no claims on accuracy of this data in the real world marketplace; this report aims to distribute the unique data collected to inspire public discussion, not to make any claims as to why changes have occurred. To see a description of the data collection and its limitations, see the data collection section of this report.

They make “no claims on accuracy”. ???