The NV corporation was set up by one of those many corporate agent lawfirms.  They accept law suit service documents on behalf of Yifu and then forward them to Yifu.  Yifu is required by applicable state and federal law to keep valid contact methods with the appointed legal representative.

To be honest, this is a criminal matter best handled by the NY State AG since that is where Yifu resides according to the filing documents held by the Nevada Corporation Commission. https://nvsos.gov/sosentitysearch/CorpDetails.aspx?lx8nvq=ozwghIfOnmFj64qH4nYDaA%253d%253d&nt7=0  Yifu & Co made advertisements on the Internet for a deliverable product, under the auspices of a US registered entity, with promises of delivery within a certain timeframe.  The FTC and standard consumer protection laws, in concert with Yifu's own claims, solidify his obligation to his consumers.

Yifu is going to end up on the wrong side of an interstate fraud investigation, spearheaded by the NYAG, if he doesn't start answering his paying customers.