Why AI companies can't stop listening to your voice recordings?

This week, Facebook came under fire for having hired hundreds of contractors to listen to and transcribe users' conversations. Last week, a Vice Motherboard report revealed that Microsoft contractors were listening to audio recordings of personal conversations of Skype users who used the app's AI translation service and voice commands sent to Cortana, the company's AI-powered voice assistant. This comes no longer as a surprise. Microsoft and Facebook aren't not the first tech companies whose employees or remote contractors listen to users' voices. Amazon, Google and Apple have been caught doing the same thing with their voice assistants in the past year (and they've all used cleverly worded EULA's to gain users' consent without explicitly telling them humans will listen to their voice).