A quick view of the website, it seems it wants to try to compete with
DBS's MCA account with debit card, which allows you to spend FX with no fees.
The downside is that it appears international USD spending on SCB's debit card attracts a 0.8% fee
¹ MasterCard transactions incurred with merchants based outside of Singapore are subject to a charge of 0.80% of the transaction as imposed by MasterCard International on us..
DBS doesn't have such a fee, so if USD spending is your main objective, at first glance, the DBS card might be better; but SCB's site says there is a 2% cashback on debit card spending. If so, it could effectively mean you get a 1.2% 'discount' with SCB instead.
The upside of SCB's account, is it seems to allow you to deposit USD currency with no charge; so if you've stacks of USD with you, it becomes a good way to push it all into the banking system. I would think once it's inside, you're free to move it around (via TT, or with a separate USD checking account). This account doesn't appear to provide any fee-free way to get your money back out as hard USD currency however.
Interesting account. DBS's MCA debit card has 2 essential features which I think is important:
a) You can change the debit card limit anytime online (from $0 to prevent all spending, to SGD5000; or no upper limit if you do it by phone)
b) You can set a the debit card SMS alert from as low as SGD1.
Would be good if SCB had similar features.