StanChart and NTUC Enterprise are planning a digital-only bank in Singapore. How do you think they would fare against banks like DBS and non-bank challengers like Grab?

Depends on :

1) User base

2) Marketing campaigns

3) Product differentiation

4) Partnerships
5) Cashbacks

It is like mobile apps. Whoever can get the customer base and keep them would most likely be successful.

Other factors like ease of use and cost will also determine how people will use such services. Think back to before Grab or Uber for ride-hailing.