Even those types of authority systems can be gamed as well, unless you're also building your own recaptcha pattern analyzer too.

The problem with decentralization is that it creates a power vaccuum that is filled by the most interested actors. Even bitcoin, with it's decentralization-by-design is actually centralized to a handful of miners in China.'

If the goal is to rebuild something that is anything else other than profit based, you need to make sure the organization running it is strictly non-profit.