I want to keep it free and accessible as a free speech relay. I just don't want it filling up with Gigabytes of porn links and other such nonsense. Switching NIP-05 verification to 'enabled' in config.toml filters out most of the most egregious spam. It's easy enough to get NIP-05 verified and a lot of clients will do it for you. But spam bots usually aren't NIP-05 verified.
Discussion
Yes you're right, we'll see if the spammers act as they are supposed to. Did you see this repo ?
https://github.com/kofj/nostr-rs-relay
Nice antispam feature
Oh it's a fork scsi-bug's nostr-rs-relay. I just added that to my watchlist. Thanks for pointing it out.