I am not sure whether this is in the interest of a user of the decentralized Internet forum. I find it hard to imagine that they would want to do without the convenience of the usual internet forums and provide extra resources for this. It's important not to lose sight of what the user would actually gain from such an architecture. Decentralized administration is opposed to user-friendliness, all of which must be justified, otherwise potential users will lose all interest in something like this. So you have to make it somewhat palatable to them. Just calling it "decentralized" won't be enough. Additionally, don't expect them to buy extra hardware or provide extra ressources just to being able to run this software