Ok so this person is now stating it is illegal and animal cruelty, just as it would be for any pet. He also said
"Once ducks are right about 8-10 weeks old, they start carrying water full time in the crop. Up until this point they have always direct washed and rinsed the crop which is where all the baby smacking and water mess comes from. They swallow it and throw it up to rinse before actually drinking.
When they start carrying the water in the crop, this water is not for drinking and this water is why no oral medication has any effect on a duck whatsoever unless it is flooded which with most things becomes toxic.
They need dunking stations to be able to rinse this water when their body tells them it is becoming putrid. This is one of the reasons they even need water at night. They have to be able to dump and replace at will."
Ok so I found both these things to be false and corrected him, but because he runs the page I am now blocked. I'm done with groups on FB