I see it as a lesson that generative AI is absolutely destroying the free web. This is similar to an attack that happened on Session and, as I've heard, on Matrix lately as well. On Session, some script kiddy ran AI to spin up a botnet of user IDs, DDoSing all the open groups with random text, and even adverts for illegal groups, thus causing the entire network -- which is similarly relay-driven like Nostr and Tor -- to completely slow to a crawl.
It took a while, but group admins finally got it under control. I'm not sure how, moderation tools are almost non-existent on Session. It made things miserable for a while and a lot of people jumped ship to other apps/other communications methods.
One thing is for certain, if there are new people hopping on board Nostr right now, this is definitely not the best first look at what this protocol can do. I hope that those new people will stick with it and not let this discourage them.