@mode13h
They've actually clarified that everytime you load a WebGL game, it counts as an install: https://forum.unity.com/threads/unity-plan-pricing-and-packaging-updates.1482750/

In any case, I hope this will help Godot, but also that there won't be many people surprised by Godot's current state or way of doing thing because they didn't look into it too deeply before switching.