Singapore is very small, so why does it accept immigrants and not be afraid of overcrowding their country?

Singapore’s immigration requirements are very high, and there are very few people who want to immigrate to Singapore and meet the requirements. For example, Singapore’s investment immigration conditions require a local investment of at least S$2.5 million, which is approximately RMB 11.25 million. How many people do you think can do this? People who really have this condition may not want to immigrate to Singapore. Therefore, Singapore uses high standards and harsh conditions to limit the number of immigrants it introduces, while ensuring that the immigrants it introduces are those who can truly contribute to their country's economy.