Why is Hong Kong launching crypto ETFs?

As a keen observer of financial trends, I'm intrigued by the recent announcement that Hong Kong is launching cryptocurrency Exchange-Traded Funds (ETFs). Could you elaborate on the reasons behind this move? Is it a response to the growing popularity of digital currencies? Or perhaps a strategic decision to bolster the city's position as a financial hub? I'm particularly interested in understanding the economic incentives and potential benefits for both investors and the local economy. Could you elaborate on how these ETFs might enhance liquidity and accessibility to cryptocurrencies for retail investors? Moreover, what regulatory frameworks or measures have been implemented to ensure the stability and security of these new investment vehicles? I would appreciate a detailed response that sheds light on the rationale and implications of this landmark development.