Gonna be honest, I think it's a dead-end. The solution IMO will come from the supply side; Easier to get receipts digitally from the store / vendor / seller, than to spend all this effort on converting physical receipts to digital.

Sure - there's good retro usage, I'd rather push for sellers to offer you digital receipts.

In fact, I already get that from my local supermarket. My bank card is registered to their app, so every time I swipe my card or scan my app (when paying with cash), I get a receipt on the app, which I can export.

I remember back in college, over 10 years ago, this was a very hot topic. Receipt management was one of those entrepreneur ideas that would always pop up.