I read today that if you have a bank account for 20 years and you do not even know it yourself, then according to the law, the bank may have all the money in the bank account and the account will expire without you noticing
I am not aware of this, not knowing mean you haven't update your bank account, right?
In our country, there is a dormancy policy that the bank will deduct a certain amount on a regular basis like every month if your balance is below on the required maintaining balance, for deposits that are unclaimed it should go to the treasury which is a government agency.
Can you specify where this news is coming from? Like a link of an article would do.