Between the 1950s and 1970s, Kinmenese weren't permitted to move away.
2020 September 10, Gerry Shih, “On China’s front line, emerging Cold War haunts battle-worn Taiwanese islands”, in Washington Post[3]:
The thaw began in 2001, when Kinmen opened transportation and trade links with the mainland. Since then, roughly 20 million Chinese tourists have streamed in from southern Fujian province, where the language, food and bowed "swallowtail" roofs on traditional homes are all recognizable on Kinmen. Until the 22-minute ferry rides were stopped during the coronavirus outbreak, Kinmenese made countless trips the other way for weekly shopping or visits to ancestral homes and temples. Those trips are welcomed — and assiduously courted — by Communist Party-linked liaison groups. . . . But peel back the jockeying among political parties, the talk of war or subjugation, and what remains is what many Kinmenese say is a basic fact: They simply don't feel Taiwanese. . . . When DPP leaders visit, Wang and her peers who voted for Tsai ask them to pay more attention to Kinmen, to promote investment that could lure young Taiwanese to settle there or young Kinmenese to move back.
2022 August 11, Frederik Kelter, “In Taiwan’s Kinmen, people hope for calm amid China tensions”, in Al Jazeera[4], archived from the original on 11 August 2022, Politics:
Instead, the Communists conducted an incessant artillery barrage of Kinmen for more than two decades in an attempt to pound the Nationalists and the people of Kinmen into submission. At the same time, the Nationalists effectively turned the island into a military colony where the number of soldiers at times surpassed the total population of about 100,000 Kinmenese.
