Likely based on the fact that they're already in mass production, so as long as they don't seem to be immediately killing people they're going to get released even without longterm data.
And someone who would travel for business if there were a vaccine at least has a reason to be an early adopter of the vaccine, whereas for someone who never leaves their house anyway it would make more sense just to wait for other people to find out whether it's safe and effective or not.
