edit: Well, I could have just checked the site, so I did. In case others are wondering the same thing,
While Star Citizen is currently in the Alpha stage
of development, it is playable now. New content,
features, and fixes are consistently added as
development continues, with a major patch released
each quarter.
https://robertsspaceindustries.com/star-citizen/play-nowAs somebody waaaaaaay on the outside, I kind of get it. I would hope that most people buying in in the last N years fully understand that this thing is going to be in more or less perpetual alpha for any forseeable future.