I learned two interesting libre software-based business models from WordPress ecosystems:
1. Selling SaaS services, just like yours,
2. Putting the software behind paywall, providing updates and support with annual payment.
For non-paying users, they will not get automatic updates and support.
But they are free to obtain the updates from other sources, since the software are under GPL license.
Usually the developers also release two versions of the same software:
1. Basic version, free of charge,
2. Advanced version, behind paywall.
Both are under GPL license. The advanced version can be an advanced version of the basic version.
But, it can be addon to provide more functionalities to the basic version.
@markosaric So with releases moving to semiannual, read-only-access to the repo will still be open, right?
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