How many are autogenerated bots is the real question?
Nostr is exploding with growth. The total amount of pubkeys writing events has passed 2 million. We're fast approaching 20 million total events published.
https://void.cat/d/AoniwoWd79pqbwQx4JdmNc.webp
https://void.cat/d/HaHsnHhwhqbEKbzz545ogd.webp
You can view all of the statistics yourself here: https://nostr.band/stats.html#total_users
Discussion
That's hard to tell as spammers are starting to use Nostr more and more.