I'm no fan of Linux, by any means. My experiences thus far with it, whilst alot better than my experiences with Vista systems, have been a major disappointment (though fun and frustrating, and not something I'll be giving up on just yet).
I must say however, the individual that wrote this complaint, is talking absolute tosh. Linux is in no way illegal, nor is it illegal to advocate people use it, and is actually free in most cases (though obviously, in the vast majority of cases, has a steeper learning curve than Windows, depending on the distro and what you plan to use it for).
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Kudos to Earthling Series #6 (CoU) for the heads up