Yeah this has been explored a bit. The problem is that it gets annoying quickly. Better to show what has succeeded. Nostrudel does / did this, not sure if still do. Snort tried but needed tweakes but all tasks slower to a crawl now. Don’t know if Damus is planning on this feature - I think it’s being discussed. 

 The recommended "add relay" block really helped clean up old legacy shitty relays. So maybe a non issue in future.