In China, Alibaba and Tencent compete for food delivery to expand access to a fast-growing source of mobile user data, using their chat and wallet super apps to funnel customers to their food delivery apps

In the West, the rivalry is direct between the food delivery apps – Just Eat, Uber Eats, and Deliveroo – and the costs of last-mile delivery dissuade challengers

In the UK, Amazon will change the game if it succeeds in its proposed purchase of a minority stake in Deliveroo, which Uber failed to buy last year. Progress on the merger of Amazon and Deliveroo is suspended by the regulator

Google’s advertising business has begun losing market share in the US, with competition from Amazon, Facebook and Microsoft intensifying in search and display

In response, the company is redoubling efforts to reshape its apps, services, and the entire web for more efficient monetisation, spelling uncertainty for partners and users

The adaptability and complexity of Google’s services reduce business risk from targeted regulatory measures, but increase the pressure for a radical intervention

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Amazon’s recent deals with Apple in TV, music and device sales mark a turning point after a decade of frosty relations

The context for this involves shifting priorities at both firms, growing pressure on Apple’s iPhone business, and rivals in common — first and foremost Google, but also the likes of Netflix and Spotify

The uneasy alliance helps both companies consolidate their strengths in the platform competition over media and the connected home — but trouble already brews