And the software is kind of weird, scanners always come Windows drivers/software so there's no issue using it there. Linux support is less guaranteed but you can check the compatibility lists (http://www.sane-project.org/sane-mfgs.html). So it's exploiting a niche in driver support between Apple and the manufacturers.
I'm not saying the author is a nutcase, but this seems like one rare data point and I'd prefer to see more companies pulling their stuff off the app store before drawing any real conclusions.