Singapore wealth-tech firms are increasingly using Hong Kong as their first major overseas expansion market, betting that the city’s large pool of idle savings, deep wealth base and role as a regional financial hub will support the scaling of their retail investment platforms.The latest entrant, Chocolate Finance, launched in Hong Kong last month with a product targeting retail investors’ idle cash. It offers 3.8 per cent annualised returns on the first HK$100,000 (US$12,763) with no minimum...