Maker here. I have made DataMask Editor to scratch my own itch performing basic screenshot manipulation tasks when producing images for my blog articles and tutorials. I don't like installing software and believe that most of the desktop apps can be replaced with web applications. Datamask Editor web app is great when I have to switch between Macbook and Windows laptop since editor works exactly the same no matter the OS.
Datamask Editor also compliments my DataMask Pro browser extension. Screenshots taken from the browser extension are automatically opened in the DataMask Editor. See the integration in action: https://youtu.be/xE8_zwH5jAs