Even though there are only 10,000 Chunks, that does not mean only 10,000 players can play on the Chunk server. Chunk server is a public server where anyone who owns a Minecraft account will be able to join the server. On top of that Chunk owners have master rights to the chunk they own, they can build on it and create experiences with our quest system.
Non Chunk owners will be able to join the server via the Party system and the Visitor system. Through these two systems they will be able to experience our mechanics and enjoy on Chunk World.