“Although open source was a viable licensing model when we launched our first CMS back in 2002, it was not apparent then just how dominant open source would become on the web,” Ellis said. “It wasn’t until Eric Raymond wrote The Cathedral & The Bazaar that open source would even begin to enter the general public’s consciousness. Since then we’ve watched the open source market grow rapidly and continuously.

ESR wrote CatB and published it online in 1997. The book was published in 1999. Have to call BS on the above quote. If they knew it was a viable model in 2002, they HAD to know about CatB before rejecting a FOSS model. If they didn't, they were grossly uninformed about the FOSS community that was already very significant at the time.