Perhaps he is an overly rich oligarch who, as an individual, is under sanctions and on the blacklist.
Of course, sanctions against Russia should not be the reason in your case. Maybe they can ban you from using the platform, but they must certainly allow you to withdraw your funds.
If I were a Russian oligarch, I would spend these stuck funds in a week or a day)
I'm not even a Bulgarian oligarch
My funds there could allow me to buy a 1-room studio.
Guys, trace carefully all of santions around - who knows what kind of them you might face tomorrow)))