That's a good question and to be honest, we're still figuring it out. Making our templates open source have the benefits of allowing the broader community to contribute, helps make Godot more accessible, and seems to more in the spirit of Godot. Of course we're a business and we're trying to build something sustainable, but right now we're betting on Godot and its community and we think elevating Godot will help us in the long run. Of course, maybe this a terrible idea, but let's find out! Part of the reason I started the company was to try out some off-the-wall ideas.
I think it’s a win-win because while the templates are a wonderful contribution, most of your work will be in the game play, set, and mechanics. You get to help other people along without a significant impact on your own bottom line, I think.