Hang on, everyone's been at this for years now - are we seriously saying that Facebook et-al don't have large training sets for speech transcription? Why are th

Hang on, everyone's been at this for years now - are we seriously saying that Facebook et-al don't have large training sets for speech transcription? Why are they still labelling this? Why do they need 100's of contractors? I can see that a couple of folks might be engaged in carefully reviewing low confidence transcription events, but 100's?