The only "unsafe" apples would be ones that might have been sprayed with some kind of pesticide not suitable for food. The parks people might assume that these apples won't be eaten and might have sprayed with something not good for you or your cider. Otherwise there are no apples that aren't safe. Maybe too bitter or nasty tasting to be "edible", but some of the real cider apples don't do well for fresh eating either.
For my cider, I use what ever comes out of my cider press on that day, which is usually a juice from 3 to 8 or more varieties of apples. I immediately pitch my started yeast culture and let it go. Haven't had a bad batch yet.
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