I’m building a fanfiction archive and I was wondering whether I should add federation just to the forum or to the whole site and if I add it to the whole site whether or not ActivityPub would be a good fit, like is it possible using ActivityPub to share the load of hosting the files across different instances or is that something unrelated and it’s only useful for typical social interactions?
It would help with sharing the load. If you want to see something similar in action, check out Ibis, the federated wiki alternative: https://github.com/Nutomic/ibis
Edit: I should add, the requests on your server would be reduced, but replicating stories from federated servers will add a load on your server’s disk and ram, I believe.