Space-adjacent seems like a subcategory that will eventually fall under the "space" umbrella as well. There's a massive amount of terrestrial infrastructure (digital and physical) that will be needed to facilitate all the upcoming orbital activity. Services like constellation management, procurement, pad construction, material handling, etc., will all likely count startups among their ranks in large numbers. All that to say nothing of "actual" space tech.

There are certain bottlenecks that have developed based on our use of space in the last half century as well. I'm definitely biased here (working on such a problem), but abstracting some of our space-based capabilities to other existing and established formats will free up some much needed room and support bigger endeavors. It is and will continue to be a very complementary industry IMO.