Due to the tax system, players from Greece have to send an account balance every day or a couple of times a week, I don’t remember exactly.
And it’s very beneficial that you have a balance of about zero, so the tricky players came up with the idea of registering in tournaments that will not be soon, and then unregister. It turns out that the account balance is about zero, and there is money at any time, you just need to cancel the registration. But it’s clear that this only works for tournament players.