I get your point and I know there are many kinds of tasks that have a similar issue: difficulty of generating a validation test ~= solving the issue. That's why

I get your point and I know there are many kinds of tasks that have a similar issue: difficulty of generating a validation test ~= solving the issue. That's why I imagine cases where it could be easier to have a set of inputs and then compare submissions by several freelancers at once (this would be the validation criteria). Given than (in my experience) hourly cost of a dev in SV > 10 x hourly cost of dev anywhere else, there should be still some margin