The limit does not exist!
Wyze Lamp Socket v2 can be grouped with an unlimited number of other Wyze Lamp Socket v2s in the Wyze app. To do this, simply assign your new lamp sockets to the same Wyze Cam during setup.
Unlike Wyze Lamp Socket v1, which can be linked to up to 5 lamp sockets via Bluetooth, Wyze Lamp Socket v2 uses Wi-Fi to pair to a single camera.