Perhaps I did not understand well what you meant above. I thought you are saying that there is no limit for the money which someone can carry with him when crossing the border, not about a cash limit for a transaction.
Well, there really are no borders. There is free movement of people, capital and goods within the EU. If there is no limit to cash payments in some cases, there is no limit to the money you can carry with you if it is of legal origin (even if you are supposed to declare them in some cases).
That's the thing with different cases, the completely free movement without control is only for the Schengen area Bulgaria, Romania, and Cyprus still have full border control, and passing from Romania to Hungary in theory should be just like entering Italy from Tunisia, the fact the controls are more relaxed for EU citizens doesn't really matter, and since OP is from Romania, things are different than for the rest of us. He will have to go through those controls, thus the risks of running into an imbecile that wants to make a quota of seized...something.
As for the Bitcoin issue, it's pretty simple and once they will take their time to adopt clear laws specifically for it it will most likely be required to declare it just as cash and gold, the logic is pretty simple (for them)
- you enter with cash, gold, bitcoins, nobody can track where you have spent it and whom you have given it to
- you enter with 1 million on a debit card, it still can be tracked, ATM, resort hotel, shop, casino it's there
That's all they care about, they will not listen to logical things like the fact that you could send those coins while you're over the Atlantic ocean, toss your phone in the Mediterranean, and still those coins would get into the country without them being able to stop, it's far easier to make other do something.
Another thing is that in a routine control at the "border" (nonexistent for practical purposes today) they do a search and they catch you those €20k in cash or Bitcoin without declaring. Then they will confiscate everything or the excess of €10k, but not if you have declared it before.
Doesn't work like that,
all the money is seized in that situation, but again,
seized and not confiscated since confiscation is possible in the EU only with a final decision on individual cases, so even if the border guards do seize your cash you still have a chance to get them back. If the court decides you haven't provided enough evidence of ..a lot of things, lol, like source, the fact that you did this without ulterior motive and so on, then they get confiscated and are gone for good.
That being said I've traveled before 2007 a few times with sums over that amount into Germany and Austria, and they didn't give a damn, never bothered to actually check the amount, signed the papers and get out of here already!