Yeah...

Everyone should be careful what they share in DMs. The risk isn't solely in your keys being compromised, but in anyone you've messaged having their keys compromised.

DMs (especially when promoted as secure or encrypted) sound safe, but that is only so long as the keys on either end are secure.

Saw a few DMs where people were talking about meeting or their locations. I'd strongly recommend not transmitting that information over nostr, even if by "encrypted" DM.