As platforms evolve, old games become unplayable. Open sourcing them will help us preserve them for future generations.
A lot of old games have become unplayable on modern hardware and operating systems. I wrote an article about how making games open source will keep them playable far into the future.
I also discuss how making games open source could be beneficial to developers and companies.
Feedback and constructive criticism are most welcome, and in keeping with the open source spirit, I will give you credit if I make any edits based on your feedback.
Development is very much a "use what you know" type of field, especially at big game companies. Learning a new game engine is like learning a completely new programming language, often because you're doing both. Every game engine has a scripting language, and very few use the same scripting language.
No risk. Godot is distributed under the MIT license. If the foundation does something shady, you're free to clone the entire engine, name it "Frodot", and continue to add features to your own version.
Exporting to other platforms like Xbox, Nintendo Switch depend on some additional infrastructure, so the same may not apply.