In the response for https://api.listenbrainz.org/1/stats/sitewide/artists?count=10&range=week I see the following odd entry:

      {
        "artist_mbid": null,
        "artist_name": "Tap to see your song history",
        "listen_count": 1931
      },

I assume the entry is for listens where no associated MB artist could be found, but that name is certainly strange/misleading.