I remember the first time I heard someone use that phrase Mark of the Beast. It was by a conservative who commented online in the pre-9/11 internet, and it was in relation to a new article discussing the possibility of using RFID chips in humans for very specific reasons. Pets have been having RFID implants to help find them when they get lost.
The guy insisted that these chips are the mark of the beast and he would rather die than get them.
I don't know if he is still around, but he if he is, he is probably someone who thinks Bill Gates is the devil for wanting to chip people but think Elon Musk is awesome for the same.