"For instance, antivirus provider Quihoo 360 was one of the targets."<p>I think they mean 'Qihoo' rather than 'Quihoo'.<p>"It’s not likely that these companies are marketing their services via adware, however."<p>Really? Not if you believe '9 Evil Tactics Used by 360 Safe Browser to Beat IE in China': <a href="https://www.techinasia.com/360-safe-browser-malware/" rel="nofollow">https://www.techinasia.com/360-safe-browser-malware/</a>