There has to be
some restriction on exactly which games can be posted. On the old forum, there were some borderline cases. The (commercial) DROD games were posted, but allowed once it was made clear one of the DROD games was free. The Spore Creature Creator demo was posted, and never locked or deleted, even though it
is a demo in the sense explicitly prohibited here- it contains one-fourth of the parts available in the actual commercial Spore game, and then the Creature Creator ties in heavily to the much larger game itself.
It's a free games forum because we like free games more than games you have to pay for. (Well, at least I do.)
I, for one, don't want to waste my money on buying a game when I could get another game for free and like it just as much, if not more.
No two games can give the player the exact same experience (unless one is a cheap clone of the other). Having a (free) game you like as much as another (commercial) game doesn't mean that the free game can be an adequate substitute for the experience provided by the commercial game, and the other way around. It's like saying, "Why buy new novels when I can read public domain books online for free?" It isn't wrong, but it limits your opportunities for new experiences considerably. (I mean, beyond the immediate attraction of not having to pay for one experience, of course.)