Hmmm, ok..I am not very techy but I think I get it. So... For instance if Bitchat automatically generates nsec/npub for new downloads (does it do that?)... And if there was a spike in downloads that could be such other events signed without Nostr profiles created (reflected in these charts)?
Discussion
I don't actually know how Bitchat works.
A profile event (kind 0) is just a special kind of note. Like a kind 1 note, but with different tags. If an npub creates that note and signs it with their nsec, then they have a profile. Otherwise, not.