Love it. One of the major challenges with email is that a lot of disparate content is mixed together.
I run a product called Inbox Zero (if you google the term we're the ones that come up first). I often suggest to users that they aim for "Reply Zero". They might get 100 emails per day, but only 5 need a reply. As long as those are handled they're probably good.
One of the challenges people face is that there's so much noise mixed together. Newsletter, conversations, receipts,... what you call "DBTC", and it's time consuming to sort it into buckets. And frankly, before AI it might not have been worth the effort. But with AI assistance, it's actually very doable. Inbox Zero offers it, as do a bunch of others. What you call DBTC could potentially be sorted for you into that folder automatically.
PS. not trying to shill our own product. It's open source so you can even self-host it without paying us anything.
right now, no. if i have a little more time next week i may enable it though. i run getinboxzero.com so it wouldn't be a tonne of work to add, but want to make sure it's done right
One good case study is Maybe Finance. It was a dead project. They open sourced it. And it went viral. And they raised $1.5m within another few weeks. The virality was on GitHub stars and Twitter.
I run a channel about open source that may give you ideas of what other COSS projects are doing: https://youtube.com/elie2222
Free to self-host.