Issues that decentralisation solves well that I'd criticise federation-based serviced for not working as well with in practice. For open-source oriented charities and foundations themselves, these are more hierarchical and organisational problems than left-right political ones.

Decentralised communities without a central discussion area work really nicely in this regard (as in, there's no "official" community). I'm currently learning about decentralised source control as a way of solving the other parts of the issue, which is really cool to me.

Fork the world!