what is the point of a free, open-source MMORPG if you can\'t modify anything?
You are free to modify and use the PS client and server sourcecode, but you would have to make your own \"world\" for a game to take place in. To the best of my knowledge, anyone is welcome to submit patches so I don\'t see how someone can be \"not welcome to participate in development\"
Other points of a Free engine and a free game:
1.) The game is free. You don\'t have to pay for it. <-- pretty big point, IMO
2.) To a greater extent than a completely closed game, the community can participate in the development. This doesn\'t mean that everyone actually has something to contribute, but good ideas that mesh well with the existing system are usually welcome.
3.) I don\'t think it\'s ever been done before on this scale, to me that\'s a whole point in itself. We currently have support for Windows, Linux and MacOS X all in one codebase, just by smart choice of platform (CrystalSpace) and a well-written networking layer.
4.) Anyone who does have C++ skills can look at the code, and discover vulnerabilities (for good or evil) This is a bit of a double-edged sword, but as it is, vulnerabilities will be found anyways so I think open inspection is good.
I\'m sure there are more reasons, but I don\'t see how PS\'s protection of their art assets and desire to reduce cheating strips away the benefits of a free game and a Free engine.