When I attended Hack Reactor they did tell us not to push them. However since they didn't teach us git (they expected us to know it) many still pushed them up. You would know because they'd get an email from some random company/person letting them know that they found their secret keys and that they should enroll/buy their services if they don't know what they're doing. Luckily no one from my class got hosed, but others in the past had.