No one promotes.
Just one of the developers decided to earn some money (and posted specials. php code exchange links in templates/engine of the site). Or someone else got access to ftp/panel and put this code.
To see who can try: EV in sape.ru to add a new project search sites in the keywords type in an address or text from the site, find the site number, and must contact the administration of the exchange to transmit data to place your website on the exchange.