Yeah they are savagesI agree Dutch Tax man is experienced in those kind of things vs. Poland or Estonian Tax man
So for asset like BTC (if you have decent amount) you would rather hold it as private person not in BV - that would be your advice? (of course not financial advice bla bla bla)
I would keep it on box3, unless you are expecting BTC to go down a lot, however that would only benefit you if you are already generating profits with a B.V.
Best case scenario is to get the F out of the Netherlands.