its already posted above , its posible for btc to have a defi but the process may not be as easy as eth defi , this can also be the reason why they didnt bother to experiment and create one  because if there are , they already announce it before during the hype of defi begins . defi is already doing well and we dont want that to disrupt by introducing new features that could gone wrong . we know defi and if you want defi there are many of them on the eth platform , arent you contented on them ? dont tell me you already tried them all