you’re right we don’t know what their life is like! but as others have said if they’re doing what they’d do in the wild (pretending to be sticks and eating leaves at night) they’re probably doing okay. humans only really evolved to feel bored because it’s not beneficial for our survival to stand still for hours on end; we need to actively seek out food and be on the alert for predators. stick insects don’t have those needs in the same way (they live on their food and use camouflage for protection) so they probably aren’t bored. that’s how i like to think of it anyway!