Is it illegal for Xiamen Tongzhi rural hukou not to apply for provident fund?

It is illegal for Xiamen Tongzhi rural hukou not to apply for provident fund. Relevant public information shows that enterprises should buy social security (five insurances and one gold) for employees when signing labor contracts, which is protected by law. Article 15 of the Regulations on the Management of Housing Provident Fund stipulates that if a unit hires employees, it shall go to the housing provident fund management center for deposit registration within 30 days from the date of employment, and handle the establishment or transfer of employee housing provident fund accounts at the entrusted bank with the audit documents of the housing provident fund management center. Housing accumulation fund refers to the long-term housing savings paid by state organs and institutions, state-owned enterprises, urban collective enterprises, foreign-invested enterprises, urban private enterprises and other urban enterprises and institutions, private non-enterprise units, social organizations and their employees.