Apps built from the same generic template or generator, common with restaurant, church, or small-business app builders, need to actually be submitted by the business itself and offer meaningfully unique content — the template provider can't mass-submit near-identical apps under different names.
Almost always caused by app-building platforms or agencies submitting many client apps that share nearly identical structure with only branding swapped.
"Your app appears to be a generic template that has not been sufficiently customized to meet the App Store's guidelines, per guideline 4.2.6."