You need to have an inspection by the water board to size the grease trap because some asshole dumped his cooking waste down the drain and created a fat berg that clogged the sewer. You need fire inspections because assholes block emergency egress, disable smoke alarms, etc. We have health permitting and inspection because people will do things like not fix freezers or leave a tray of raw chicken in 90 degree heat on a tray perched in the grease trap.
Entrepeneurs are great, but many will cut corners to make it work. I’d rather not get poisoned to advance their dream.