Didi is the Chinese Uber, and Uber's market cap as I write this is $90B, so on the face of it $70B for a fast-growing market on track to be several times larger

Didi is the Chinese Uber, and Uber's market cap as I write this is $90B, so on the face of it $70B for a fast-growing market on track to be several times larger than the US doesn't seem crazy. Of course, that's assuming Uber's valuation is sane, which is not a bet I'd personally be willing to take.