I've now open sourced Mast! So you can see exactly how the app was made. Woo! 🎉❄️
@JPEG Hey, just had a quick look. You’ve released the source but it’s not open source :) (https://github.com/ShihabM/Mast/blob/master/README.md)
If you release it under a GPLv3+ license you will ensure exactly the same outcome (no one but you can sell it on the iOS/macOS App Store). And it will be FOSS. Which will get others to contribute under the same license. (You can also ask contributors to license their contributors so you can include them and keep selling it too.)
@aral Hey, my bad! Any guidance on where I can find this or how to amend it to the required license?
@JPEG Sure: https://www.gnu.org/licenses/gpl-3.0.en.html – GitHub should have the option to select it / create your LICENSE file directly also.