My position depends on "free" being a broadly-applicable concept. If I'd said "Crockford's license is not DFSG-compatible" then the response would (quite rightly) have been "well, who cares, the DFSG is just Debian's set of arbitrary rules". The reason the line between free and non-free matters so much from a pragmatic perspective is that there is this consensus, the criteria for being included in Debian are (more-or-less) the same as those for getting free hosting on sourceforge, or for being able to use the OSI trademark, or...