Since there is nobody that really should be sending me something privately over such an insecure channel as nostr DMs, I assume that anything in my DMs are bots. If you DM me, I will probably ignore it, and even if I don't, will likely treat you like a bot. By the way, I love a good bot in the morning!
Funny, the one DM that I do get and care about doesn't even show up as anything more than a notification that I have a DM.