In Watch Dogs Legion a Spiderbot is called the Infiltrator Spiderbot Tech Gadget. This is one of the many gadgets that you can keep adding to your loadout as you progress in the game. Different gadgets are of use for your various missions in the game. The Spiderbot gadget however cannot be unlocked by default, unlike many other gadgets. To get this gadget you will have to purchase it.
In Watch Dogs Legion, each recruit has some unique and useful skills. A beekeeper, for example, can control bees that can be used to attack the guards. A game developer has the skill to summon a drone which can be used for keeping an eye on the enemy. A Spiderbot is one such infiltrator and it is capable of doing a lot of things ranging from entering secure cabins and rooms, hacking, knocking down enemies.
How to Get Infiltrator Spiderbot in Watch Dogs Legion
Throughout the UK city in the game, you can see a green glowing icon. This icon is the Tech Point, wherefrom you can buy or upgrade the gadgets in Watch Dogs Legion. The Tech Point is the currency that you use in the game for purchases. In the DeadSac base, you will get the first 10 Tech Points. This is at the beginning of the game when you connect the AI with the server.