Ah, these comments again. Open source is great and I have my self contributed to several open source projects, but it is not the solution to everything. Products like Word/Excel/PowerPoint/etc, Visual Studio, Photoshop, Figma, Windows and Mac all have many open source alternatives, but the fact that these products and companies have been hugely successfully and continue to do so says something -- commercial companies can organize and reward work in a way hardly found in open source projects, and their products often provide added value (more features/specific support for certain workflows/professionally designed UX/product support etc) that can be rare or nonexistent in open source projects. For some thing that is as complicated as a game engine, maybe there is a reason open source solutions are not mainstream yet.