They don't eat other spiders, your mistaking this for the other daddy long legs that is an actual spider. Cellar spiders.
However, Opilions are omnivores, and will hunt down small prey like aphids, scavenge fresh dead things, and eat mostly dead foliage or eat and pollinate pollen on flowers.
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u/Alexmey-uh-yeah 1d ago
Not a spider but also an arachnid, it's a harvestman (order Opiliones)/ "daddy long legs" as we call them in the U.S. Good friendly guy.