Didi funded Uber's US rival Lyft to end the China subsidy war

By the mid-2010s, Didi Chuxing was locked in an expensive subsidy war against Uber for the Chinese ride-hailing market, a fight both sides funded with enormous rounds of investor capital. But Uber's actual financial strength came disproportionately from its dominant, largely unchallenged position in the US market, where it faced no rival remotely comparable to what Didi represented in China — meaning Uber could keep subsidizing its China operations indefinitely by drawing on capital raised against its secure home-market position.

Simply trying to outspend Uber directly in China meant fighting a war of attrition Didi couldn't reliably win as long as Uber's home base remained untouched and fully funding the fight; the real constraint on Uber wasn't its willingness to spend in China, it was whether its US position stayed secure enough to keep generating the capital to do so.

In September 2015, Didi invested $100 million directly into Lyft, Uber's main US rival, as part of a broader strategy of backing Uber's competitors across multiple markets simultaneously, including Ola in India and Grab in Southeast Asia — building a loose global alliance against Uber rather than fighting it only on Chinese soil. The investment helped Lyft compete more seriously for US market share, applying pressure to the exact market Uber had treated as secure.

Didi invested in Uber's US rival Lyft, forcing Uber to defend its home turf and split its capital across multiple fronts, ending the China subsidy war.

Uber's China war chest depended on its profitable, unchallenged US business.

A credible US threat made Uber reconsider the cost of an endless China subsidy war.

Funding Lyft, Ola, and Grab split Uber's attention and capital across multiple fronts.

The multi-front pressure led Uber to negotiate a sale of its China operations.

When a rival's strength comes from a secure home market, attack that market by funding its competitors there, forcing it to defend multiple fronts.

In August 2016, Uber agreed to sell its China operations to Didi in a deal valued at roughly $7 billion, with Didi investing $1 billion into Uber's global business as part of the arrangement — ending the China price war on terms favorable to Didi rather than continuing an open-ended subsidy fight.