What I would like to ask is whether this product exists in the banking system of your country and why, in your opinion, are there central banks that do not allow it? Also, is this possible on online virtual banks?
From your notes, I can judge the meaning: not all banks operating in certain countries have the same rules, your country has a system like that and my country like this, as far as I know banks in our country really respect their customers, Whatever is done by the bank must have approval from the customer, there is no forcing, let alone issues regarding money, freezing or other things that make the customer unhappy and suffer losses.
Our bank here has a deposit system, meaning that those who make a deposit agreement within a certain period of time, for example six months to one year with a minimum nominal deposit of $15k to $150k will get a percentage of profits from the bank, Of course, the deposit agreement cannot be liquidated before the maturity date, even if the customer dies, but the profit interest will still continue as in the initial agreement, only the customer's family can transfer all of it.
The point is that banks in our area have deposits or funds that are locked for a time agreed upon by both parties, but the bank does not just lock them without approval from the customer and the applicable law.