Danger from the Deep is released under the GPL, so that anybody can do anything with the software as long as it retains the GPL license. It's therefore totally legal to sell it for a profit, the person doing that doesn't need the approbation of the devs or anyone.
It's a good thing, having other people distribute it increase the visibility and availability of open source software.
A dev team can for example take the DftD source code, add some contents/scenarios and sell that for a profit. Ultimately, it will benefit the community since new content has been developed for everybody to use/modify/resell.
It's exactly how (for example) commercial Linux distributions work, RedHat, Novell, etc... are basically doing just that, selling a collection of selected work from other, making millions $$$ but this is a good thing since they improve the product.
However, apexsoftware is a bit deceiving by not telling their customer the product is unfinished and by not telling it's under the GPL (and therefore available from other sources as well), but if people are willing to buy without checking what the product is first.... it's their own problem!
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