Its not a scam if you do it with reputable companies. Binance also provides cloud mining services. There isn't any ponzi scheme for renting your computing power to others for an hourly charge. It was one of the most widely used methods for scamming back in 2017. At that time, there were a lot of bitcoin cloud mining service providers on the market and most of them ended up being scams after a few months. If you want to use cloud mining services then use any reputable platform and centralized exchanges are one of them.