super high, if we use other countries' experience as barometer, up to 3x more in certain cases.
reasons they can do that:
1. Throwing huge initial capital to gain market share
2. Lower operating costs (no physical location/staff)

Hong Kong's first digital bank offers 6% rate for deposits that dwarfs HSBC's
"ZA began a pilot last month for the city's first digital-only bank. It's offering the 6 per cent rate for three-month Hong Kong dollar deposits capped at HK$200,000 (S$34,700)"
As comparison, Standard Chartered, HSBC and BOC Hong Kong Holdings pay 1.9 per cent to 2.3 per cent for the maturity
https://www.straitstimes.com/business/banki...at-dwarfs-hsbcs