I haven't encountered any anti-dutch moves so far. (I'm just new here at chess.com but even at live games, still, I haven't encountered them.)
If white tries the Staunton Gambit
I try to be careful on every play, but I'm planning to play d5 on the next move, protecting the e4 pawn.
as for the 2.Nc3 system, here's a sample game
I hope I shared something useful. I don't play the Dutch defense anymore because of the "Flying Dutch Bishop" variation.
you can avoid that move order by playing 1...e6 first before doing the f5 pawn move. But if you play the Leningrad Variation, then the diagram above, you can always play 2...g6
Ran into a new treatment... 1) D4, F5 2) G4, D5 3) C4... I played FxG4 but
I doubt that is right... white gets a big center with natural moves NC3, BG2
and E4... What are the strategic ideas for black?