https://redecentralize.org/blog/2021/01/18/centralization-is-a-danger-to-democracy by Michał “rysiek” Woźniak
A great article about how decentralization can help democracy.
The main advantage of decentralization is that every community have their own rules and moderation that make it harder for "bad apples" to get hold of a community.
The author gave the example of Gab (white-supremacist community) who tried to come to the fediverse. All the other community of the fediverse simply defederated Gab, meaning that Gab became isolated.
Turns out not many people like talking to or platforming fascists.
It reminds me of the book A Pattern Language: Towns, Buildings, Construction where the authors argued that communities need to stay small and have their own rules.