It's subject to absurd feature creep and overambition, in addition to regular ol incompetence.

The design goals for Star Citizen are kinda absurd. It's like how the No Man's Sky devs claimed at one point they'd individually simulate air molecules and a unique periodic table, except the difference is that NMS axed that (or more accurately, were never actually doing it) instead of spending the next decade trying to make it work.

At the same time, it helps that their supporters have essentially given them a financial incentive to keep adding feature creep instead of releasing, because if they release a game they can't keep asking for more donations for increasingly lofty goals.