I don't think this is as far-fetched as it seems at first glance: lots of open-source software products that are developed under "business-friendly" licenses such as EPL or ASL form the basis for commercial offerings. It is more likely that patent trolls would go where the money is and sue whoever makes the commercial product, but it is conceivable that the open-source foundation of such an offering would be targeted as well.

Man, 'write' is for beginners. I rather find out the person's terminal device and then cat directly to that device; something along the lines of cat >/dev/`who|grep ^username|head -1|awk '{print $2}'` ;-)