Alright, here’s how it goes, and I want you to take this as impersonally as possible: I couldn’t care less about who my site visitors are, or what their browsing information could be, or if they have sensitive data to be mined. You found your way here, and that’s good enough for me.
However, I built this danged thing on WordPress, with all the fun little plugins one needs to enable for a minimally terrible experience for the reader. And unfortunately, I can’t vouch for the people writing those plugins. So yeah, somebody, somewhere is probably adding your data to their base (numerically identified, in the way of all proper aggregate data sets, no need to sully it with something so base as names).
So, let the reader beware, but no more aware than you would have to be for every other website.