If this was a tenanted unit, then I agree with Whale that an outgoing condition report by the letting agent should have picked up the missing door closer, and the tenant should have been charged for it. Although owners may squeal and protest when getting a bill for damage to or missing common property, they are the ones who engage letting agents, not the owners corporation. If they employ duds, then it’s up to them to fight it out with their agents, and if necessary sack them and get a better one. Astute landlords also take out landlord insurance to cover them for damage to the building.
Interference with fire doors and their closers could result in a life threatening situation for other residents of the building in the event of a fire breaking out within one unit. If such a door is left open flames and smoke could penetrate into the stairwell, making evacuation difficult or impossible.
It probably should be mandatory for fire doors to be labelled that these are part of the building’s fire safety protection, and should not be removed or modified.