First of all your title is wrong, it should be "El Salvador launches bitcoin Bank soon"
El Salvador is really doing great away from legal tender now a Bank! I give El Salvador their flowers !
Do you really think so? What is the essence of decentralisation if you would still need a bank?
So far as am concerned this is a great threat to decentralisation. Its just thesame as storing your coins in a custodial wallet which means they will control your keys.
Remember,
"Not your keys not your coins"