"Community feeding works as long as all the hives are being feed, not just one or two."
It also depends on the temperament of the hive. I have 3 hives here at the house. One of those will try to rob at the drop of a hat. I have tried as far as 1/8 of a mile away, two weeks ago. Both other hives were attacked (unsuccessfully due to reducers), my carport where I have supers with bee cleaned drawn comb stored gets filled with bees, my barn fills with them looking and sniffing. Litterally the one hive goes everywere it can looking. There are hive top feeders on all my hives also. Trying to get rid of some undrawn comb in broken frames. This is not a one time thing, I have tried several times this winter.
My wife said this last time "you knew better".
On the bright side, as Michael Bush said, "they are very good foragers"