https://www.theregister.co.uk/2019/08/08/microsoft_skype_translation_spying/

If you use Skype's AI-powered real-time translator, brief recordings of your calls may be passed to human contractors, who are expected to listen in and correct the software's translations to improve it.

That means 10-second or so snippets of your sweet nothings, mundane details of life, personal information, family arguments, and other stuff discussed on Skype sessions via the translation feature may be eavesdropped on by strangers, who check the translations for accuracy and feed back any changes into the machine-learning system to retrain it.