Decades ago I considered opening a restaurant with my sister.
We built a business plan. We studied menu design, food waste calculations, dollars per seat per hour, advertising costs, time to profit, and a million other things.
Our business analyst said that 2/3 of new restaurants went under in their first year, m8ostly because NOBODY THINKS ABOUT THOSE THINGS!
So every time I hear about how a billion restaurants will be going under, I remember that they are almost all started by people with three great recipes and no clue.