ARDC is notorious for radio silence followed by soundly rejecting claims for address space. They're absolutely squatting on it and hoping it flies under the radar, as noted in other comments.

Even so, we're left with less space than we had before. To my knowledge the FCC is pretty liberal with dishing out public RF spectrum ranges to private entities, but they're much more conservative with turning over private RF ranges to the public.

Every part of the RF spectrum that the public loses is unlikely to be reclaimed. We have less airspace, permanently.