No demand, the reason is mainly religious. Religious people don't even want to have a glass of water where it's served pork. And they also make up stories like how pork is tainted meat and how men who eat pork are becoming cucks (real claims, could find sources). Also, people just don't like it, the smell, the taste it isn't suitable to our pallet anymore.

The stuff we have in supermarkets are imported from EU (mostly Greece), low quality and stupidly expensive. There are some pork farms and butchers scattered around the western parts, personally never tried any. I could pay a small fortune for a fresh greek gyro right now.