Yes, you are able to advertise for free by writing on Netarhia. Your ad is made of rel=”nofollow”-free links, with text that you choose, placed within a context that you write. Call it advertorial or call it whatever. This is the future of online advertising, if you ask us. The majority of internet users are already ad-blind to most of the other forms of online advertising.
You may even place banners or other ad images inside your article, within the boundaries of common sense (crossing those boundaries will be swiftly punished). The content you produce in this way could be(if the administrators sense it and there’s a strong commercial scent to the article) flagged as sdvertising, discreetly but visibly, so that visitors know what to expect.