Another fun fact: itadakimasu is categorized as a keigo, or more specifically, kenjougo, an honorific expression that depreciates speaker itself. And since itadaku is an advanced version of morau to show that "I am of lower status", so the whole expression should be (from the gods/kamisama/the people above me who brings me here for the feast) I humbly receives.

This is also why you say itadakimasu even when alone, despite there are apparently no one superior than you exists, but no, it is now the gods you appreciate