Fwiw I've had this happen with Mistral, I fell right in the middle of them changing from opt-in to opt-out AND removing their org-wide dial (on the Teams plan). They reversed that last decision (the org-wide dial returned) about 48 hours later, but in the process they turned all sliders for all my staff back to "on". Not sure if it was all malicious (I think not, just a very crappy move that hit our trust in them pretty bad). After some emails they ensured me they stored no data for training. But strange things happen.