I'm sure something like that will become widespread. In the discussion I was having on nostr, the concern that was expressed about my idea was that it would limit the entry of new voices with good ideas, if they didn't have the sats built up to comment on popular notes.

The problem of limiting entry, seems even greater with this email type spam filtering. I'm not trying to have a public conversation through my email account, so I'm happy that the spam filter is pretty aggressive. I imagine it could be dialed way back for nostr to just weed out the most obvious stuff.

I like the idea more from the standpoint of content curation.

In general, I like the idea of introducing more tools for individuals to customize their nostr experience.