They would regret it when players start having kidney failure or drop dead among other crazy side effects (roid rage and depression, shriveled testicles, breasts, acne). If it's going to be on the honor system but steroids are still illegal in the US there's going to be issues like any other drug where you are dealing with shady drug dealers and who knows what they are selling you. Not to mention there's certain protocol you have to follow when taking it and a teenager or young person might not do it correctly and have issues. Also steroids are super expensive. Like thousands of dollars per month. Where are young people going to get the cash? Then you run into issues with boosters giving them money for roids or kids stealing or getting in deep with drug lords over money. Too many things can go wrong. It's like opening a can of worms. Steroids are illegal for a reason imo