Two months ago, Lin Rui-siang, a young Taiwanese man wearing black-rimmed glasses and a white polo shirt, stood behind a lectern emblazoned with the crest of the St. Lucia police, giving a presentation titled “Cyber Crime and Cryptocurrency” in nearly fluent English to a roomful of cops from the tiny Caribbean country.The St. Lucia government would later issue a press release lauding the success of Lin's training course, which had been organized by the Taiwanese embassy, where Lin worked as a di...