The Bitcoin ecosystem has been building DeFi infrastructure:

dotswap and Alkane Protocol swap are both on Layer 1;
Unisat does sidechain partitioning;
Radfi assets are on Layer 1, while transactions are on Layer 2;
RGB still hasn’t seen a truly usable product;
various other protocols also haven’t been particularly outstanding;
even platforms or protocols on other chains often claim to be part of the Bitcoin ecosystem—either they’ve minted same-named assets on the Bitcoin chain, or they just say they’ll migrate into the Bitcoin ecosystem later. In short, they want to borrow the name “Bitcoin” to boost their image, but they aren’t willing to decentralize and want to keep everything under their control—occasionally risking being “hacked” 😄
There are also alternative approaches. For example, DMT nat and many runes are cross-chained to Ethereum and Solana to form pools for trading;
the rune dog has an app that supports foreign users to deposit and trade directly;
going deeper, Alkane’s upgrade to Subfrost aims to build various DeFi applications such as lending and collateral staking—it’s no longer enough to just play with tokens and NFTs on Alkane Protocol;
in the future, the Bitcoin ecosystem will definitely see breakout products—maybe a certain coin, or an NFT that sparks a boom;
and with Ordinals’ feature of permanently storing data on the Bitcoin blockchain, it still looks attractive enough—maybe an NFT of 10 BTC per image that supports the currently popular image-coin gameplay will emerge?