Organisms don't evolve; evolution is a statical process of species. The organism's metacognition about this behavior doesn't affect its evolutionary fitness, re

Organisms don't evolve; evolution is a statical process of species. The organism's metacognition about this behavior doesn't affect its evolutionary fitness, regardless of whether the spider is lonely, or thinking strategically, or perhaps just acting on instinct without any anthropomorphic higher level thought process. Whyever they think they're doing it, apparently it works.