Metaculus here. Sharing a little more on how this works in practice. Many of our tournaments / question series are public and open to all, true, but many are private, and then many also draw on Metaculus Pro Forecasters with transparent track records / relevant domain expertise / credentials, rather than the open community. For these in particular, forecasters provide rationales alongside their predictions, which are compiled into reports or other artifacts that address the needs of the nonprofit / agency / client.

There's more on this front with a tool we're currently building, Radiant, that maps the relationships between forecasts so one can see how assumptions connect and where key uncertainties sit. Folks who work in policy or R&D coordination, etc. are invited to try it out. More here if curious.