I frequently get this question and there’s 2 ways of thinking about this:
1. A significant number of people buy the game just to read it; and that’s a solitaire activity I’ve definitely intended the game to support.
2. I haven’t yet written a solitaire mode but it is something I keep looking at doing. My biggest reservation is that the rules load is already too big and having one person take on that load is genuinely going to be a problem. There’s also not too many places that a single person is going to have an impact in the future - a crew is kind of the minimum group size to do so and I’ve already cheated by halving the crew size from 8 to 4.
Nonetheless, I’m sure people have tried to play solitaire. And I’ve pencilled in a couple of solitaire options for update 5 that’ll be “supported”.