Most preserving solutions are like that and at the end the funding or business priorities (google groups) become a serious problem.
I think we need something like web - distributed and dumb easy to participate and contribute a preservation space.
Look, there are Torrents available for 17 years [0]. Sure, there are some unintresting long gone but there is always a little chance somebody still has the file and someday becomes online with it.
I know about IPFS/Dat/SBB, but still that stuff, like Bitcoin, is too complex for a layman contributor with a plain altruistic motivation. It should be like SETI@Home - fire and forget. Eventually integrated with a browser to cache content you star/bookmark and share when it is offline.
[0] https://torrentfreak.com/worlds-oldest-torrent-still-alive-a...