Sounds like a cool idea, but the indie game market is also highly competitive, so actually earning some money is not easy.
Do the people involved so far have prior experience in making games? Godot is a solid choice, but you still need good game artists and the like.
I am involved in a FOSS game dev community over at https://freegamedev.net but admittably it is mostly hobbyists with no real interest in selling their games.
But if you are willing to keep your development open-source and fully transparent I am sure there will be some people interested. There are a few fully FOSS games that never the less are relatively successful commercially (Mindustry for example).