My Theory of Fetish is this:
There's four different kinds of fetishes. First is modified sex, where their fantasy is still sex, but with specific conditions: "I want to be fucking [a car/a furry/in public/lunch meats]." Second is abstracted attraction, where their fantasy is a feature people find attractive, but they're fixated on that feature in specific: "I want someone with [high heels/a corset/long hair/big earrings]." Third is power play, where their fantasy is either to exert power over someone else or have their own power taken away: "I want to [tie someone up/watch a girl sink in quicksand/turn my son into a sock/force myself to eat my own cum]." And fourth is comfort/escapism, which is pretty straightforward: "I think it's (sexually) nice when I am [wearing diapers/covered in pies/Bugs Bunny when he dresses like a lady to confuse Elmer Fudd]."
So vore, depending on the person's tastes, probably ticks either number three or four, or maybe both. If they like "hard vore", with all the death and digestion stuff, it's definitely power play, while if they like "soft vore" where they're just kinda stuck there, it's probably somewhere between power play and comfort/escapism, depending on how consensual they like it and whether they're the one eating or being eaten. Like the guy who came up with the furry vore ambulance seems like they're mostly into it for the comfort thing, even if most of us would not find that experience particularly comfortable.