As stated in another thread, Webroot's marketing department pushes their narrative fairly well. Once they are confronted with a known truth about their software, they seem to clam up or refer to a study for x-amount of years ago. Well, that was then and this is now. MSPs often used Webroot due to its cheap licensing, being extremely light in resources, and just ticking the box. MSPs, however, seem to be coming to their senses about this truth, which, I believe will lead to a lower market share. (As an aside, Best Buy seems to have veered away from recommending Webroot and offering it with a 6 month trial, maybe leading to a greater market share.)
Kaspersky, despite the brouhaha from the NSA ordeal, has evolved as a company and improved their software. I give props to Eugene Kaspersky for his corporate glasnost - I guess that's the most appropriate word - and I personally have enjoyed Kaspersky software. I think the smear campaign against Kaspersky punched below the belt and probably made it off-putting for millions of consumers.
All in all, Webroot is not surprising with their market share. What is surprising is the fiery virulence with which people defend Webroot. It's software, you should be critical of it since no criticism leads to complacency and that ultimately leads to failure. I do hope OpenText makes the necessary changes for Webroot to properly flourish in the near future. Until that point, my better judgement insists that I do not install it on any device nor recommend Webroot.