How GravityView handles licenses with WordPress Multisite
If you network-activate GravityView on a Multisite network, it counts as a single activation.
If you don't network-activate GravityView, and you have each site activate the plugin individually, each site will count against the license limits.
Please note: a license is for a single person to contact support. If you run a network, each site should not contact support; they should contact you (the license holder), and then you would contact GravityView support on their behalf.