"Before we rush to pull Userful's oxygen, perhaps we should ask ourselves what the consequences would be."
I doubt per-seat licensing is all their oxygen. Usually there is also a fixed project price and consulting fees on extra work. Most likely the per-seat cost is even included in the fixed project price when Userful is pitching their deployment project to countries.
Even after losing the per-seat revenue userful would still sell projects and consulting as the most experienced wide scale deployment provider.