If this is the same Ghostery that makes the Chrome/Firefox extension, they were in hot water a few years ago for selling the extension to an ad agency. That ad agency almost immediately turned around and started selling usage data to the sites whose trackers were being blocked.
Basically, Ghostery was selling info about how users were using the extension, how their trackers were being blocked, and which trackers were present on different users’ browsers. And the extension had this data collection quietly turned on by default. It also meant that ghostery was only acting as a middleman in the data collection process (and profiting as a result,) because the trackers were still able to get the info; They just had to pay Ghostery for access.