Comment by andris9

I use a similar model for EmailEngine (https://emailengine.app/). The code is dual-licensed under AGPL and a commercial license. The app has limited functionality by default - you can either buy a license key to activate it and use the app under the commercial license. Or fork the code, remove limitations (really easy to do, one or two lines of changes), and use it as AGPL. At first, I did not have that artificial limitation and no one was interested in buying the commercial license. Once I added that extra step, I got some customers.