How to acquire new users?

I recall a scheme from a few years ago where companies would recruit college interns under the guise of employment. Once there, they'd make the interns open mobile phone SIM cards, then register for various apps under the pretext of "product research." In the end, they'd earn several hundred yuan per person through referral bonuses... I think some places still use this trick (labeling it as company phones or product research, and interns—too new to question anything—become easy targets).

For instance, registering a mobile SIM card can easily net you nearly a hundred yuan in referral fees. Here's a reliable channel for mobile SIM card promotions.