Uber's biggest Chinese rival, Didi Kuaidi, has invested an undisclosed amount in Lyft, according to The Wall Street Journal. It's still unclear how the pink mustache-loving firm will use the money, but it's already begun discussions with its Chinese investors. Didi Kuaidi is a joint venture between Kuaidi Dache and Didi Dache, two of China's former biggest taxi-hailing services, which joined forces earlier this year to stave off Uber's growth in their home country. Turns out part of the merger's strategy is to force the American ride-sharing firm to focus on other markets, including the US, by helping fellow Uber competitors grow. Back in August, it also agreed to back GrabTaxi -- another fellow competitor operating in Singapore, Malaysia and the Philippines.