Why G2A Is Killing The Gaming Industry

I read and heard somewhere that the way G2A got the start they did was they would simply use peoples credit cards and buy games ect.. then charge them back so they get their money and get keys alot faster from the companies and have more money to go over and over and do it again and again but Im not 100% sure if thats true or not but it for sure seems like a shady way to do business in my opinion