What would make you comfortable analyzing a personal chat?

While building MyChatWrap, I kept coming back to one question: how do you make it easy to explore a personal conversation while respecting how private that conversation is?

I chose to process chat exports in the browser, so the chat content stays on the user’s device. But I know a privacy claim alone may not be enough to make someone comfortable trying a tool.

What would you want to see before using it as a sample chat, a clear explanation of how processing works, or something else? I’d especially value hearing what has earned or lost your trust in other products that handle personal data.