if the network gets bigger, content moderation / filtering spam, bots, account farming, illegal content will become a big challenge for nostr, maybe already is.
Discussion
This is a huge issue, indeed.
It's too easy for malicious actors to just create a trillion npubs, each posting the same spam message.
I have already experienced such attempt. Luckily it was "only" made out of ~50 spam accounts. Was really annoying though, because it used a lot of tags & obviously you have to block once per post, since every npub just posted one post, each....