Yeah if you read careful the homepage you can found some history about the project , is a project very ambitious ( about their goals) Do a game like this is very expensive, even for the great studios,my he best example fue the last Age of Empires Online, they try to make a game pay to win , and sell some civilizations as DLC following a freemium model, but the game don't was like they were expecting. Because don't have art direction like a hardcore game , was more oriented casual gaming, but the RTS never was a casual genre, even is one most hardcore genre. Now returning to 0 A.D the project have about 15 years in development, but started working around 2004 ( was the first time I meet the project), in 2009 the first pre alpha was released and the project works slow but constantly and have great standard and quality.