I understand they are separate processes (compacting memories vs training new models), it just surprised me to read that my chats are used for training.

This is how it's presented: "Temporary chats Opens in a new window don't appear in Recent Chats Opens in a new window or Gemini Apps Activity Opens in a new window and aren't used to train models or personalize your experience."

I'm guessing you're maybe on iOS? I don't see these UI elements, not in the App on my phone nor in direct web access.