Effective January 1, 2024, we will introduce a new Unity Runtime Fee that’s based on game installs. We will also add cloud-based asset storage, Unity DevOps tools, and AI at runtime at no extra cost to Unity subscription plans this November.
https://blog.unity.com/news/plan-pricing-and-packaging-updates
A rather large hurdle to adopting Godot is the inability to publish games on consoles with it.