Why are people leaving Hong Kong?

A letter to the South China Morning Post comments on statement by China rep in Hong Kong that people aren't leaving the city for the UK because of the national security law. "Is it because people are attracted by Britain’s higher tax regime? Is it because Britain has such exquisite culinary delights as toad in the hole and spotted duck? Is it because the cramped and largely non-air-conditioned London Underground is a much more pleasant form of transport than the MTR? Is it because a predominantly English-speaking country is easier to navigate when Cantonese is one’s mother tongue?"