Which includes 100% of freeware, and 99% of weekend "hey let's put this on the net and see if people want it" projects.

Both of those things used to be a big part of the Mac software ecosystem, but they're slowly dying away. And if Apple moves forward with its apparent plan to prohibit unsigned code from running by default, while charging $99/year for the privilege of having your code signed, both will be effectively extinct within the next year.