[Edi]

Without mandatory registration you only need one [censored] trolling for kicks or obsessed with some tiny thing to totally wreck things, as evidenced by wikipedia. The problem with fanmade projects like the Dom3 strategy wiki is that there are few people who want to do any work but hordes of people who will gladly sponge off the work of those few, even if there are ways to add contributions of their own.

And some people, like me, prefer keeping control of what they make completely to themselves, so such individuals can be difficult to convince to join such projects.