Most conferences say something similar when they open the call for papers. While I understand the reasoning and motivation behind such statement, organizers shouldn’t be afraid of a talk that demonstrates a particular service or product. The key of course, if that service or product provides a great value, increases productivity, or solves a problem very well.
Most conferences prefer talks on open source projects. There are some truly amazing open source projects. But, just because something is open source or free, doesn’t always mean it’s a great framework. In many instances there is a vendor behind the open source project that wants you to pay for consulting services when using its “free” framework.
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