China was selling creatine with impurities. They sold milk that was contaminated and it killed their own children. Do you think the black market steroids that counterfeit legit steroids from China are safe? Not saying this is the cause. Just saying it could be. A bodybuilder can't take steroids from unknown sources sold from the trunk of car in the parking lot of a gym and think these are legit, look at the box and insert.
Bodybuilders are taking steroids, insulin, growth hormone, LH, anti estrogens, thyroid hormone, speed, epo, oil site injections, and who knows what else then say the risk to health is over stated. If you are risking health to have temporary drug muscles you have a fragile insecure ego that a syringe isn't going to fix.