If you want to see the creepiness that's being described here:

1. Login to a Nostr client with someone else's npub.

2. Go to the messages area

3. Select a conversation.

Everything except the text of the messages is visible. The text is scrambled, but emotes to messages, the person you're chatting with, if a comment is a reply to another, etc is all visible.

nostr:nevent1qqsr36y4rlkakc2xtleqxxlzwfhnlt72u3a4wm60s6c47k2zr228f5qpz4mhxue69uhkummnw3ezu6twdaehgcfwvd3sygr6mdfqcwk8edkusff4pr0secwewhdynlha4x6uj4n5fgzf6gc2ecpsgqqqqqqs9hyn7j