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Maybe the glut of conventional food leaves the prospect of eating their compatriots less appetizing.

Probably not; these aren't closely related spiders. It would be like a human eating a monkey, which is something humans like doing.

But if the smaller spiders can fight back at all, it might well make that battle less appealing.

Spider fight is wrestling about who does the one shot one hit, they do not hit or puncture in other in order to make just a mechanical damage.