That's what they used to do: https://news.ycombinator.com/item?id=48708270

The OP had posted a detailed reply here as well, that they since deleted - I think because they didn't want to deal with all the pushback here.

It actually does use IMAP! The app connects directly to Google's IMAP servers via SSL straight from your machine.

I intentionally chose a local IMAP pipeline over the official Gmail API because of platform gatekeeping. To use the API for this, Google forces independent developers into a "Restricted Scope" tier, which requires an annual $15,000+ third-party security assessment.

Going the local IMAP route lets me bypass that completely while keeping user data 100% local and secure.