there is a post about them at http://www.who-is-who-in-gpt.com/forum/index.php?showtopic=9522 looks like they have had problems with malware, although they may have cured that by now ?
They have harassed me lately too about advertising.... Everyone is probably waiting for a positive response before trying it out.
I have found more alerts about AntVenture from 2009: http://msmvps.com/blogs/spywaresucks/archive/2009/07/14/1700082.aspx