Hello, I'm Vivek, founder/CEO of HackerRank. Our intention with this initiative is to takedown plagiarized code snippets or solutions to company assessments. This was definitely an unintended consequence. We are looking into it ASAP and also going to do an RCA to ensure this doesn't happen again.
Sorry, everyone!
EDIT: update here https://news.ycombinator.com/item?id=31092085