Liam, that's something a lot of us have pondered over the years, especially in relation to freeware that is easily downloadable.
How does it fit with Spybot, Adaware, free anti-virus programs, even for that matter browsers like Mozilla? I've got all sorts of free software on my poota, and regular checks with Spybot tell me I am un-infected, as does my anti-virus program. What's in it for them?