To be clear, it is currently costing the taxpayer said thousands of Euros. Time spent by government workers on FoI requests is meaningful and not free. That does not make them a bad idea, but we should be clear that passing costs on to the requester isn't precisely nefarious?
Of course there should probably be a way to limit waste, but putting all financial cost onto a single person is a way to effectively limit freedom of information to the point where it contradicts and undermines the whole idea behind it. That's one of the reasons why this change is being proposed, and it is not a stretch to call this nefarious.
The current cap of 500€ is a good compromise IMHO: It deters people from issuing unnecessary FoI requests while at the same time keeping it in reach for the average person if they really want that information.