The fundamental issue with decentralization is the challenge of decentralized information governance. This can be summarized by the idea that there's no cost to making a statement.

However, there is a solution: Reputation.
Reputation addresses the issue of cost without involving money.

I believe that without a Decentralized Web of Trust (DWoT) Reputation system, an open decentralized social media or wiki platform will never achieve critical mass.

Until DWoT is implemented, a decentralized wiki remains a futile endeavor.