If you are a DM, there are dozens of ways to homebrew a giant spider to make them fit your theme. For example, you can give your spiders elemental damage if they are in a certain environment. Ice spiders can do frost damage with their bites, perhaps freezing their targets when they are paralyzed rather than poisoning them. Rock spiders could use their stealth to camouflage themselves as statues and instead of shooting webs they could have the skill 'Earth Sense' which allows them to sense the number and direction of anyone else touching the ground. Rock spiders might count on their durability to make up for not shooting webs, instead using their claws to batter foes around before they bite down with rock hard jaws. You can do this for every single type of spider. Just take a look at where they live and consider what adaptations they would have used to catch their food. It's not difficult to change some abilities and damage rolls around, or even to use the giant spider template to make new creatures that act like spiders.