How do DeFi owners make money?

How exactly do owners of DeFi platforms and protocols generate revenue? Are they solely reliant on transaction fees, or are there other creative monetization strategies in play? What factors influence the profitability of a DeFi project, and how do owners balance risk and reward when seeking to maximize returns? Additionally, how does the ever-evolving regulatory landscape impact the financial sustainability of DeFi initiatives? Can you provide some real-world examples of successful DeFi revenue streams?