It is the Tor Browser. From the official project. It lives at https://www.torproject.org/download/ - Literally the first thing you get directed to if you go to a search engine and enter something like "download tor".

This fruit could only be lower-hanging if it shipped with Windows.

If they can't be bothered to look for the single most obvious non-malicious use of the thing they are trying to detect, it says very concerning things. Things like "we beta test our file removal tool in production", except "production" is "millions of unwitting people's PCs" rather than some website.