Yes, I know the only person who posts here nowadays is me (though I hope that might change sometime in the future). That does not mean I will tolerate folks signing up just to post ads.
Just to be clear: reviewing a game someone else made, praising it greatly, and posting a link to it? That's a review, not an ad.
Linking to a site that is selling something, while not posting an unbiased review of said thing: that is an ad.
If I find an ad in your sig I will remove it. If you post an ad I will delete it. If you do either of those things twice I will delete your account and IP ban you. That is all.