LOL, if you look at the amount of money Google has poured into Google and how much they got back for their investment, it's laughable.
Things like the Wavenet "contributions" are just Demis paying lip service to the fact that once in a while Google was nudging them to produce something, anything really that was actually useful.
DeepMind has researched and developed features that exist in many Google products today, e.g. Wavenet: https://www.deepmind.com/research/highlighted-research/waven...