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I don't think a forum is possible on IPFS?

To my knowledge, it's content addressable, and therefore limited to static content, because if the content of a file change, the URL to it changes.

You can keep the assets/media to IPFS and use a small server to host everything else? With proper archival, seems doable in a scalable way.

But that server has to be on the open internet, and can be trivially attacked.