Obviously Apple Support Community precedes these advancements in decentralized web (and you could argue they benefit from centralization) but still, I don’t see a reason not to copy the nostr model of signed notes for public forums.
For as broken as nostr is, there is so much more comfort in being able to have a local copy of your notes and being able to rebroadcast them should the need arise, and knowing it will work as if nothing happened.
In a way, a freeloader in nostr is more “protected” than a person running their own mastodon instance, because the domain you lease is not yours, and your handle is tied to that.
Also tangentially related: flatpak closed their discourse forum and redirected users into Matrix. Maybe nobody takes knowledge preservation seriously anymore.