I don't see the point in telling the therapist. It has nothing to do with me believing it is okay to look stuff up- which I do think it it. It has to do with me not seeing how it would be useful for me to tell a therapist or what the point would be for me. If someone does want to tell, then have at it. I react the way I do because it often reads like someone is confessing to a transgression - which I don't believe it is, and seeking absolution from a therapist of all people. I do not believe it necessary nor the therapist's place to do so. I do not see this as an ethical problem or being sneaky or going behind anyone's back. It is public information. Hacking into their computer, setting up a camera or placing a tracking device on their car might go a bit far. But other than that, I think it pointless self flagellation. I also don't care enough about most people to bother looking stuff up and the therapist is not someone I have any desire to know more about. If one is convinced this sort of thing is a big ethical deal, then I suppose one might want to know why one has it as an ethical thing but does it anyway if it is a pattern. But if it is unique to the therapist, then again I think it is making problems where none exist.
But tell away if it suits you.