You can still use AGPLv3-licensed Grafana for commercial purposes without paying a fee.

Grafana’s license is a . It allows them to give away the core product to the community (fueling adoption) while monetizing the features that massive corporations require (SSO, Oracle support, and legal safety).

Grafana License: A Complete Guide to Open Source and Enterprise Options

This is the proprietary version. It uses a commercial EULA (End User License Agreement), overriding the AGPL.