DItto is a nice nostr relay that can filter out Spam plus the Soapbox Web UI. Soapbox was ported over from  the Fediverse. It was used by Gab, Spinster.xyz, and TruthSocial.  

 So use soapbox web ui connected to ditto relay?  

 Yes, Ditto will serve the Soapbox Web UI for you.  

 Do nostr clients like Amethyst not work with ditto? 

 They work fine. All you have to do is add the relay to your relay lists and you start showing up on at least the global feeds of, whatever ditto relays you add. 

 Ok so this is a bit like the outcome of nip42 AUTH and isolating a relay

Do notes broadcast beyond ditto relay if user does not isolate their relays just to the ditto relay?