Short: fwupd users download small but in total too much metadata over the internet.
A solution for local distribution is needed. IPFS is too slow, Bittorrent is immediately suspicious on many Networks.
Passim is a new protocol for this purpose, users can opt out, it is secure and the metadata is hashed, and the hashes still downloaded over the internet for verification.
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For people who prefer to read: https://fedoraproject.org/wiki/Changes/Passim_P2P_Metadata