Well, when they announced the Ford 150 Lightning, it was supposedly going to be quite inexpensive as well. Of course, by the time it actually came out, it was 2x or 3x the price that they had originally announced.
That's hyperbole. They announced at 40K for the base model. Briefly sold it for that to people with early reservations, then jacked up the base price to like 48K. And a year later they kept on raising it, peaking, as I recall, at just under 60K. It was never 2x or 3x unless you are counting the worst examples of the dealer mark-up gouging. But that's not a problem Ford could do much to solve. And by 2024 they were selling for quite reasonable prices -- I got my extended range Flash for 50K out the door, which was a good bit less than the hybrid I had been shopping for.
There are routinely mark-ups on popular vehicles, and I bet there will be a period of time when this is true for the Fathom as well. Early adopters are willing to pay extra, so the market is there to take advantage of that.