100% according with you. Anyway, I just propose a "I give you a tool, and you decide if you want to use it legally or not" (last thing I want to see, is Marcik involved in license problems).

In the other hand, I have been speaking with my local FSF contact (sounds nice :P), and he had not a very clear opinion of the whole thing... It seems, is some kind of blopper or no-one's land in GPL license... he finally told me it doesn't seem very GPL-compliant, but doesn't break it either (of course, with the adecuate programming styles, avoiding static links and all that).

To me, it seems something like: I have MS Internet Explorer. I make a GPL MSIE plugin, and then, I claim MSIE to be GPLed.

I can't give a final answer, but I don't think there will be any legal issue in this case. I think we can make sputnik, and GPL addons. I will tell something, as soon as my friend (the FSF's guy) tells me something.