The profits from business with crypto are huge. If a forex trader takes 1 week to make 5-10% profit, with crypto they can earn up to 50-100% in just a few days or a week. That means better returns in the same time. In addition, crypto is not just a currency, it's a technology product.
So basically the reason of entering cryptocurrency industry because the rate of profit you can get is higher compared in forex. Honestly, we have the same reason why enter this industry and that is because of the profit we can get through different transactions related with crypto. Decentralization is one of the reason as well why I choose to be with crypto because I want a currency that is cannot be manipulated by someone.