Multisite and GravityView Licenses
If you network-activate GravityView on a Multisite network, it counts as a single activation.
If you don't network-activate GravityView, each site will count against the license limits. You will also need to individually activate the plugin on each site.
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 you should then contact GravityView support on their behalf.