Just thinking numbers, there might be 100 free software projects that you'd consider "security related", and each might take a couple person-years of developmen

Just thinking numbers, there might be 100 free software projects that you'd consider "security related", and each might take a couple person-years of development time to port on average. If you put a ballpark salary of $50k to that time, that's around $100,000*100 = $10M. And that's a conservative estimate because each of those factors are probably too low.