Technology companies entering the financial services industry have become a global phenomenon over the past decade. This trend is most remarkable in China where two large technology firms (BigTechs) have emerged as important market players, especially in payment services. This paper examines the factors driving this development and whether the Chinese experience could be applied elsewhere. Several lessons emerge: first, like any company in a network industry, it is important to build and maintain a large user base and that is the key factor behind BigTechs' expansion into the financial industry. On this basis, these BigTechs can be seen as "accidental financiers" rather than "aggressive invaders". Second, these firms are cautious in offering higher-risk financial services as investment losses could lead to an exodus of customers. Third, Chinese authorities' regulatory tolerance during the early stage has been a key supporting factor and helped fostering innovation benefits. But that was balanced by the implementation of capital and liquidity rules to keep BigTechs from "excessive" growth, mis-selling of financial products and posing systemic risks. Fourth, initial conditions and government support matter. The rapid growth has benefitted from China's large population, the availability of low-cost mobile handsets and heavy investment by the government on mobile communication infrastructure. These may not be easily be replicated elsewhere. Last, BigTechs' overseas expansion may require policy coordination between home and host authorities to keep track of emerging risks.