They are. Sites keep a digital snapshot. Everything you post on Nostr should be assumed permanent—including your profile pic and the timestamp when you posted it.
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ye gotta be careful for sure, I just checked on primal and everything is updated to my current PFP.
Snapshots of your Note ID carries all the data with it—including pfp. How much do you trust these random strangers on the internet who run relays?
apparently enough to use this protocol everyday, though, not much trust in general