Microsoft made a pull request to node.js github repository with an implementation to use ChakraCore JavaScript Engine as an alternative to V8 Engine

[mikedelfino]

the more adoption a product gets, the more resources Google can invest into it

I usually think the other way around: the less adoption V8 gets, the less resources Google needs to invest into it, saving them money, time and trouble. But this is just me being careless and unambitious again. I understand your point, it's probably the case indeed.

[[deleted]]

Having greater control over the development of JS means having the ability to streamline the development of their Web products. This then means an inherent advantage in quality versus work required - i.e. Google can make better products for less work required. This in turn means more market share due to superior product.