hey, good question. tbh a lot of the newer stock sites are definitely mixing real photos with ai generated stuff now. it's kinda hard to tell sometimes, you really gotta look for the tell-tale signs like weird reflections, strange fingers, or just unnatural looking compositions.
for stockcake specifically, i'd check their 'about us' page or their faq section. they usually mention if they allow ai content or if it's strictly real photos. some platforms are even fully ai these days.