Starlink Premium service is $500/month but SpaceX is asking $4,500/month in Ukraine. There may be some justification for this but it looks like a bait-and-switch.
And the service of the post you're responding to is $15,000-$24,000/month.
Given that the service operating in areas where there are no or limited groundstations available, this is actually more equivalent to the maritime service, which runs at $5,000/month.
Starlink Premium is still for fixed service, not mobile. Even Starlink RV is not for use while in motion. Starlink's mobile offerings are Starlink Maritime for $5k/mo and Starlink Aviation for $12-25k/mo. $4500/mo seems totally justifiable given the military use. By the normal standards of military contracting, it's a veritable bargain. SpaceX is continuously defending against Russian hackers now that Ukraine is relying on them so heavily, and also developing methods to resist jamming. Probably a significant fraction of all people working on Starlink are dealing with this stuff in one way or another.