This is a helpful summary. I suppose the flip side - in part (not to let them off the hook) - is just the challenge of launching a banking product in a different country and culture, away from your home turf
The grocery model is famously hard to export, Tesco tried to break into America and failed. Most supermarkets (with the notable exception of Lidl and Aldi are) are national rather than international. Maybe banking will prove similar? That’s been the general pattern with traditional banks and its not obvious that just because the challengers are tech companies they can instantly overcome this