that's a valid point. and it has to made clear, that the relevant question is not "why is the account locked" but "how can customers get in touch with the bank to discuess the situation and come to a solution.
this is, in my opinion, one of the most relevant questions at all for choosing a bank.
on the other hand you have to say, that N26 does not clarify in a transparent way, what people can do or can not do with their account. it's "hey, open up your account... here, sign in, we call you via video... show us your id card and BOOM you are in".