VOvortico·Oct 4, 2020
We (https://vcvrack.com/) do this and it works great for us and our users. Wouldn't give up the licensing scheme for the world. We'll soon release a proprietary fork (Rack for DAWs) of our GPLv3 software (Rack) as a new funding source. It's the perfect funding scheme and has no major disadvantages. The author makes profit from a fork of the software, which requires/causes the GPL version to be actively maintained (since new functionality and bug fixes of the proprietary fork often derive from modifications of the GPL software). And the user has a choice of using the open-source/free software, which they can freely run, review, modify, and share, or purchase the proprietary software. By Economics 101 theory, a "trade" is always mutually beneficial if the user's intrinsic value of the software is greater than the purchase price.
As mentione
Read the rest
d by others, we can't accept patches to our GPL software without a contributor license agreement (such as a paid contractor position), so make sure you're aware of this before choosing the dual-GPL/proprietary scheme for your own software. This isn't a big concern for us because in my personal experience, a patch that actually saves me time in the long run is very rare (See Quality section of https://github.com/VCVRack/Rack/blob/v1/.github/CONTRIBUTING.... You get what you pay for.) But I'm perfectly fine with doing everything myself or through hired work.