I noticed #amethyst auto blocks some npubs I've never interacted with. How does this work? nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcppemhxue69uhkummn9ekx7mp0qyghwumn8ghj7mn0wd68ytnhd9hx2tcewvzaw #asknostr 

 Spammers that you don't follow are blocked. You can disable the filter on the Security Filters.  

 Got it, thanks. Do spam reports determine who's a spammer? 

 No, just 5+ equal posts in a short period of time