According to the WSJ article, Hong Kong operates pegged currency regime with the US dollar. In 2019, as protests in Hong Kong grew, resulting capital outflows put downward pressure on Hong Kong dollar (HKD). To support the domestic currency, Hong Kong monetary authority spent part of its international reserves. Even though it has plenty of international reserves, some analysts expressed doubts over Hong Kong's willingness to defend HKD. What was the basis for such doubts