I'm not too familiar with Humble or their product. I can say that they have spammed multiple OSS communities that I am a part of without contributing or even using the OSS from those communities.
This is a trend that is continuing to be a problem with promoting and Humble is taking advantage of this trend.
Checked out Humble after I saw the app as one of the submissions for TC Disrupt Berlin. Cool concept, tried it out and I see a lot of potential in building the app up as a full-service recruitment solution. As an engineer, I prefer the direct approach with a company, instead of being spammed by recruiters who hardly know my strengths and wants. Humble brings me one step closer to that better experience. Would definitely use more often if and when it comes as a native app :) Good job, guys!
Two communities i'm in -- have been spammed by these guys. They didn't answer to any questions, just trying to get attention.