[Digger]

16 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:

This is not needed today. Your eye scan will do the same.

[Valpal1]

A finger print or eye scanner might have been interpreted as something “marking” or reading the mark on the person’s hand or forehead, especially to someone with no knowledge of fingerprints or retinas.

And is that what they are doing? Reading the individual’s unique markings.