I find it strange that they'd tarnish their reputation to try and compete with LinkedIn, but they seem to be a LinkedIn data partner? (not sure exactly what that entails).
Open your console on their site and paste this in:
I think the opposite is true; when given no concrete feedback, one begins to hypothesize why they were rejected, and their mind will often point them to discrimination as the reason.
If one is given clear, concrete feedback ("We rejected you because you didn't come up with a simpler algorithm, and you lack experience with framework x"), there is little room for them to think they were discriminated against in any way but their skills/experience.