Go to https://tools.wmflabs.org/hashtags/search/wiki or any other search (but not just tool main page). Observe requests to https://drive.google.com/*, https://ssl.gstatic.com/*, https://apis.google.com/* in browser console networking tab.
Issue about this was created on Github repository linked in tool footer: https://github.com/hatnote/hashtag-search/issues/32 . No reaction followed so far (22 days).
Obviously either a clear notice about using third party services with links to respective ToUs and Privacy Policies should be present on all tool pages or no such services should be used.