Godot is an open source, community-driven project. All of the work that's done to build, test, document, and otherwise support Godot is done primarily by passionate individuals contributing their time and skills. For the majority of contributors, it is a labor of love, and they take pride in helping to build something of quality that people enjoy using.
In order for Godot to continue growing and improving, there is always a need for more members of the community to step up and contribute. There are many ways you can help out, regardless of your skill level or the amount of time you can commit.