Oh well. And nobody advised you to open one more account with some another fintech, at least as a backup... Sad.
To be honest, I have somehow overlooked the word “thousand” in your phrase “bank account with several hundred thousand euros”, so I have not got how bad the situation really is – sorry
In such a case, it is really worth considering to consult a local lawyer. From what I have seen,
Blackcatcard is not in a
bankruptcy, they just lost their banking relations. (Even if they went bankrupt, your money should be protected in a ring-fenced account, BTW.) Anyway, your money cannot be seized, you did not do anything bad. So it's just about finding the way how to pull it from BCC...
(And really, for the current business, open an another account as quickly as you can. Do not overlook that it is well possible you will reach the situation that BCC will not be able to re-activate your account but just send your money to some other account of yours. As for the recommendation, you have more options; my first bet would be Intergiro – they are accepting new clients again, AFAIK, or perhaps Verifo; both have nothing against Maltese companies.)