Do you train AI on my life?

Not unless you have said yes to a specific, separate question, and every one of them is off until you do. By default your archive exists to build your Echo and nothing else — not for us, not for our provider. In Settings there are 3 distinct permissions, each with its own wording, each one you can take back: letting the way Iphthimé asks be improved, letting the judgements you make about your own Echo be used to improve Selione beyond your own archive, and letting us ask you to judge other companies' models of you — that last one pays you for the time, and the result is published about the system, never about you. None of them hands anyone your sentences. And we do not sell or license your archive, to researchers or to anyone else.