To OP: just want to say you have my sympathy. I completely understand your frustration but I was fortunate and with the help of this forum, got my bp to eat when he was little. Now as an adult, he started that fasting trend again (he stopped eating for 6 months, ate again, then in late Oct started again) but the husbandry is on point, his tub has been downsized, prey item is the same size or tried mice, and left completely alone and still he would rather do anything but eat. That's fine, whatever, it gets annoying though because I love feeding my snakes.
I guess some animals are fine living life on the edge.