Acquiring a stake in all the over-valued startups seems like a double-edged sword. The valuation markdown at the time of IPOs of these startups will affect Uber too.
But ubereats and other Uber subsidiaries that they sold were themselves over valued, You can see these acquiring a stake as diversification in highly competitive marketplace.
Without a doubt. And most of them won’t have the market to get the lofty valuations paid out (which didn’t even work in the best funded market - the US)
Yandex definitely isn't over-valued. It's undervalued, if anything.