As the Dutch, we were early adopters of social media. One of the platforms was Hyves, which hosted millions of Dutch profiles where people could send each other public messages known as "Krabbels" and...
Hyves ran on a database that one company could switch off, and it did. Moving those Krabbels onto Nostr changes the failure mode; it does not remove it. Relays are cheap to run and nobody is paid to keep one up, so an archive is only as durable as whoever keeps paying the bill. That is the part funding should cover, above the app built on top of it.
Identity is the other open question. Old Hyves profiles were accounts on someone's server rather than keys the user held, so every ported profile is a reconstruction by whoever runs the import. Content addressing helps there, since post text can be checked against the original dump even when the name attached to it is chosen later. Pinning the source data somewhere citable would make the whole thing verifiable years from now.
Identity is the other open question. Old Hyves profiles were accounts on someone's server rather than keys the user held, so every ported profile is a reconstruction by whoever runs the import. Content addressing helps there, since post text can be checked against the original dump even when the name attached to it is chosen later. Pinning the source data somewhere citable would make the whole thing verifiable years from now.