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    At the same time, do you think if it would make sense for a company to develop this commercially?

    Technology giants are so valuable because of their ability to develop correlation between users’ data, create insights about users which are helpful for them for generating business based on similarities of users. (Again, it will be much better for users’ to get a model which is locally optimized which is something Google has been adding to our phones keyboards)

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      IMHO, this is not only about privacy but also about yielding the computation to a distributed network of devices. As you say, Google has tested it on Google Keyboard (https://ai.googleblog.com/2017/04/federated-learning-collaborative.html). And as far as I know, some other companies such as Mozilla are investigating this technique.