So I do not think you must have some problem with them because it is more than once they confiscate your withdrawal
That line of thinking will allow sites to scam users. If it's their word vs. Nitrogen's and you always pass off complaints as problems associated with the user, then scam accusations will never go anywhere.
It's simple, really. If the community members are allowing you to scam because to them, it seems unlikely that you would do so, then you should.
Kind of like poker theory. If the rational thing would be to never bet, never betting ≠ the best decision.