They have a validation process, and the data is mainly meant to train speech-to-text. For that, it's important to include accents and even non-native speakers,

They have a validation process, and the data is mainly meant to train speech-to-text. For that, it's important to include accents and even non-native speakers, especially in English. I think that those wavenet models for TTS were able to be conditioned by gender and maybe accent, if they had the data.