You need to own 3 Alpies to play the game, however, the game will not be limited to only 3,333 players. These Alpies will give beta access to the game. Once the game goes public, it will be more inclusive because there will be a breeding mechanism which will allow these Alpies to produce more Alpies(different generation, lower stats). Breeding will earn Alpies holders revenues by allowing them to sell their newly generated Alpies. This mechanism is similar to Axie infinity.