These cannot be used in commercial print for discerning customers.
I've found great results on Flickr with a Creative Commons search, and buying stock photos for commercial work is a tiny part of a print piece budget.
Yeah, I'm not sure that's his target market. Most of the people who would use his images probably don't even know what CA is or how to spot it -- they just care about "free".
I imagine that more serious image hunters would stick with the big stock agencies.