Silverfish in a restaurant
I would not advise eating there again. Silverfish or harmless to humans, but their presence can signify some serious hygiene issues. While silverfish are most known to feeding on decaying wood, in a kitchen setting, they are signs of 1) poor moisture control, which can include leaks and spills that are left unmopped, and 2) the presence of uncleansed floors, corners, and prep areas. Silverfish are particularly fond of starches and food debris. You can find a quick summary of silverfish in a food prep setting at Cannon Hygiene.