Come to think of it, isn't BTC the best of them all? Imagine if all decentralized finance is running on BTC?
By definition, DeFi is a concept that describes financial services that are built on public blockchains, so in a manner of speaking, Bitcoin is the first DeFi implementation. However, today, most of the financial services that could be classified as DeFi are available on the Ethereum network through the use of dApps (decentralized applications).
The following article describes it in more detail: What is DeFi? Everything you need to know about the future of decentralized finance
