Qwant sometimes hits Tor users with this puzzle after they submit a query. Then after solving the puzzle, they’re brought back to an empty form so they must re-type their query.
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Duckduckgo has started this too. Very annoying.
Edit: just realised this post was from 3 years ago… I don’t know why this popped up lol.
Uhm… DuckDuckGo has worked and still works just fine in Tor for me?
This is the second post under “hot” on my home tab BTW.