Looks like they've got some decently popular open source repos - https://github.com/coqui-ai/TTS https://github.com/coqui-ai/TTS for example - so I wouldn't be

Looks like they've got some decently popular open source repos - https://github.com/coqui-ai/TTS https://github.com/coqui-ai/TTS for example - so I wouldn't be surprised at all if Google and others used that, even if only for their own research and comparison. That's my charitable interpretation anyway.