I don't think the focus on incentives is the best way to look at the problem. A different perspective is that decentralized social services fail because of the

I don't think the focus on incentives is the best way to look at the problem. A different perspective is that decentralized social services fail because of the lack of capital/revenue and sufficient management structure to compete with their centralized, commercial counterparts. Money can fund a team of great designers, engineers, testers, marketers, sysadmins, writers, translators, product managers, to name a few. Together they can roll out and maintain a service that meets high standards of quality, uptime, usability, reliability, engagement, customer support... The things that actually matter to people. Decentralized solutions really don't stand a chance against a well-funded company.