Ghostery allows you to OPT IN to sending your browsing data [1], which may be sold as part of services offered by their parent company to improve ad ROI for their customers. They also tell you that they're collecting the request data [2].
I think knowingly sharing your data (with a positive affirmation) is significantly different than having your data collected and sold without your knowledge
[2] https://www.ghostery.com/support/faq/ghostery-add-on/What-da...