> ... when you don't have access to ...

These days, "don't have access" is a micro-market. Everywhere else, indoor growing has to compete with the cost & delay of importing. Last I heard, even Antarctic bases are only growing a few fresh veggies - 99% of their food is imported. (Well, plant-based food. They might do a fair bit of fishing.)

> CEA has been used ...

My comment was replying to magemaster's "large scale vertical farms ... just technologist delusions".* Vs. greenhouses - which can be little more than plastic sheeting over light wooden framing over sunlit dirt - yes, those have far saner economics. Mushrooms - which can be grown in dark caves without dirt using prehistoric technology - are also a very different thing.

*To quote Wikipedia - "The modern concept of vertical farming was proposed in 1999 by Dickson Despommier, professor of Public and Environmental Health at Columbia University.[2] Despommier and his students came up with a design of a skyscraper farm that could feed 50,000 people."