"Ingredients: Apples, Calcium Ascorbate (a blend of Calcium and Vitamin C to maintain freshness and color)." https://www.mcdonalds.com/us/en-us/about-our-food/nutrition-...
Unfortunately, my world view doesn't include, or understand, pre-cut apples.
More broadly, pre-sliced apples are convenient for schools and daycares (much like frozen fruit is convenient). Things like this might make it more likely for convenience stores to offer more fruits since they are shelf-stable a bit longer.
I now understand my world view was rather narrow in this regard. A whole spectrum of equally valid methods for apple consumption are now clearer to me.
But previously, I was unaware of the seemly widespread under-served demand for pre-cut apple.
Break the skin near the stem with thumb nails for an inch or so along a great circle line, then grasp between palms with the stem between the proximal joints of your thumbs, and press the thumb joints together while trying to pull the apple apart.
Once the apple breaks, put one half aside for a few hours and see if the interior surface browns. YMMV with apple type & bruising.
I suppose that breaking the fruit divides it between cell walls, while cutting breaks cell walls along the cut. Enjoy.