Yeah that can be a bonus some times. There is no local agriculture of raising yummy meat makers around here, so the few local coyotes helped curb the feral cats that were killing all the small game in the area. For the past 3-4 years I actually have small game around. For a while I had people trying to make my corner Gravel Pit on the old homestead in to a cat colony of all things. All that did was feed the Eagles, Owls, Chicken Hawks, Fischers, Coyotes, Wolves, Bears, Bob Cats, Hunterswhohatethingskillingallthesmallgameinthearea and Car Tires. In an area where its mostly Black Spruce Swamp, that isn't very good for feral domestic animals to live. I let some goodie two shoes people rescue any they could get, with WRITTEN permission to be on my land and phone number. Things got interesting when the people who tried to make the colony called the cops on the "Trespassers". Nature makes its own balance one way or another. No worries of a mini Australian cat problem, winters kill them off mostly.
The half Russian type swine some one tried to released, almost starved till they discovered deer feeders, and as they moved in the winter the wolves discovered them.
But the biggest wild critter feed makers are cars as they hit the almost to many deer around here. They kill so many deer the bald eagles have never migrated in the winter for almost 2 decades now.