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 The relays in the 'p' tags are hints.  I'm not sure they are useful in kind-3 events as we use NIP-65 now to specify what relays the people you follow use.  Gossip may or may not write them (I can't remember).

The contents however are YOUR relays, if you choose to store them there, as some clients have done in the past.  This is very old stuff, Damus and Astral stored them in there to auto-configure when you went to a different client.  Gossip reads and uses them if it can't find a NIP-65 event.