(Yes, I'm still analyzing Free, Freemium, et. al).
So as I've noted many times – and as can be noted elsewhere – giving things away for free builds trust and you can make money with Freemium. Building trust with free items is an old technique that sadly seems to need to keep being relearned by people.
Free as is rather obvious, is common now with free game demos, free comics, free online books, Freemium games, etc. We're awash in free things.