Doesn’t matter. Make food people want to go in enjoy and pay for, pay the bills (ingredients, rent, insurance, marketing, labor, management, equipment, etc.) and remain profitable. No dipping into moms coffers.
That’ll put an end to “I can make myself a Reuben with store bought stuff for $3!!!, $13 at the deli is goddamned capitalist pig ripoff”
Also the cost to develop, deploy, and maintain your robots.
BTW, most fast food does use robots as far as possible; these are highly automated processes. The robot might not look like you'd expect, but that aint a problem with the robot.
Well I mean people won't order from a 100% automated fast food shop. The customers expect human hands to touch and labour over the food, even if it's financially unviable.