If you want to construct a story — which we both agree strays from the article — where I agreed to provide a specific service and if I failed the agreed remedy

If you want to construct a story — which we both agree strays from the article — where I agreed to provide a specific service and if I failed the agreed remedy was to refund the payment, then, yes I agree to refund you with a cherry on top. I think you are correct to want remedy. A big fix, a refund, a workaround, an apology, a million dollars, or a withdrawal of the study. Depending on circumstances. In my world, most of the implicit contracts are. Shit happens and try to fix it. Yours might be refund me.