I can see your point, and obviously DA isn't actually solving combinatorial optimization problems while ITA is. The problem is that this problem will likely on

I can see your point, and obviously DA isn't actually solving combinatorial optimization problems while ITA is. The problem is that this problem will likely only attract devs actively looking for work. DA is a well known site, and I have no doubt that there are many good and happily employed devs who have peaked at the job description, but as you can see in the comments here this test is off-putting. If you're not in serious need of work, this doesn't seem to be worth your time (and in my experience good devs are rarely in serious need of work). I think the reason for the low P(we hire you) is that you may be accidentally skimming off the cream here. At the very least try getting people on the phone first so they can say "hey these DA guys are pretty cool and interested in me, it's worth jumping through a few hoops", or make the test seem interesting/fun/challenging