Because on nostr, our reputation is our identity. You could spam, you could be a troll, you could be a horrible human, you can do all of these things and no one is stopping you. You're going to ultimately have a bad experience if you do these things or only be able to thrive in your own private small corner of Nostr. And that's perfectly fine, because spam filters, mute lists, and private relays fix a lot of these issues. In the future we may have relays sharing IP ban lists via gossip if spam gets too bad, or maybe we'll have dedicated relays that use LLM to search for content to matches certain criteria and removes it, to sanitize the experience and those relays will be the onboarding relays. Either way, the beauty of nostr is simple. If you want to be a dick, you can be and if I don't have any to see that person being a dick, I just need to put in a little proof of work to make it happen. Both parties win and that's the difference.