Defi is imposible on btc. TPS too low, protocol is just not suitable for this
Depends on what you mean by "DeFi" imo. Does P2P lending count as "DeFi" since there's no centralized party involved? Does DeFi needs smart contracts or you can just use a multi-sig txs? Etc. There's a side-chain too, so that could be a solution.
How is DeFi on Bitcoin!? (really asking) I wish there was as many defi applications on btc as ETH.
If you search about it, you'll find something like atomic.loans.