Who benefits from DeFi?

Who exactly stands to gain from the rapidly growing decentralized finance, or DeFi, space? Is it the individual investors seeking higher yields on their digital assets, or the developers and entrepreneurs building innovative financial applications on top of blockchain networks? Perhaps it's the institutions and traditional financial players looking to tap into this new frontier and stay competitive. What are the key advantages that DeFi offers to each of these stakeholders, and how might they capitalize on them? Furthermore, how does DeFi impact the broader ecosystem, and what challenges does it face in terms of regulation, security, and scalability?