Their food and labor costs have risen. Fast food businesses have very narrow profit margins and having to pay their workers $17/hour makes it very challenging for franchisees to make any money. I won’t say that they don’t work hard, I owned a pizza business for about 10 years and had some very good employees but liberal cities insisting that they make a ‘livable’ wage is, ultimately, going to be their undoing. If you’re trying to support a family on a fast food job, you never had a fucking chance in the first place.