When it comes to Spiderfolk, spiderling and spidertaur, what would be something poachers would have a reason to hunt them? I could only think of two things, Their venom, maybe blood like dragon's blood for eternal life, or even their exoskeleton due to thickness. But you also got possibly their fur. o3o'
Hmm interesting question! Venom is the first thing that comes to mind for me too. Or possibly the fangs themselves, as they could be used to make poison-infused weapons. Exoskeleton for armor is also a good option. Fur...I'm not completely sure. I don't think you could get like...a pelt from them the way you would from furred mammals IRL but that really depends on how you explain their physiology.
Though, dark thought, their silk might be valuable too, so capturing a live spider might prove more valuable than killing one. Though it could also be a situation where the parents are killed and the child is captured (or attempted to be captured) with the intent of raising them in captivity.