Yeah, using a /30 per hop is a bit of a waste, but one /24 is still insignificant to the Internet as a whole, especially when it's in the middle of a parent allocation.

Presumably if Epik runs out of IP space in their /20, they'll just shut this down. It's not like some other company could use that /24.

Again, if ARIN/IANA really wanted to reclaim "wasted" space, they'd be looking at the holders of big blocks like /8-16, and asking them to justify usage, not one random /24 which is ultimately insignificant.