Anything artistic is deemed intellectual property and can be protected as such. Under copyright, depending on definition, this would expand to distribution, derivation, reproduction, etc.
Now you may say that you're protected because anything created by the tools of EA is theirs, but we're not talking about maps here.
I have no idea of what you're taking from your time at FHT, or what you've done, and this here will be used purely as an example to demonstrate a point:
Let's say you recreated the BF1942 FHT map Bukit Timah. Again you can't really go after someone for using an EA tool, right, let's just assume that is correct. But what about that heightmap? It can easily exist outside of either a BF1942 or BF2 map. Say that FHT were to pull a copy of that heightmap, invariably a simple image file with a common format yet digitally unique enough to be protected. How likely would it be for that file to match with what can be pulled from your version of the map? Just a slight derivation? And of course, that is but one example.
Now for another example, say an actual case were to be made. Here is what such a presentation would look like:
http://forgottenhope.warumdarum.de/armyrage/And more! While the old website is lost, I am certain that Forgotten Honor retains a copy of the database and old files, complete with the dates they were created or last modified. That may not be enough if copyright has not been established, however, it may be sufficient for a moral judgement.
And in what courts would this all transpire? That would be the decision of FHT, not my business. Again this is just an exploration of possibility.
Spending several hundreds up to 1000€ out of your "budget" (you called it that) and more per year on non-defined "other costs" - that is not a business. That is just intransparency.
The hypocrisy here is you appear to have the same people on your team responsible for that in the first place. How long until you exaggerate your expenses by as much as 1.5x or 2x to protect against the possibility that you may fall short on funding?