My impression changes according to the type of service. If it keeps Bitcoin in a safe place for investors and gives them certificates or access in their banking services without the possibility of withdrawing to their wallets, then this type of adoption is bad because it exposes investors to risks. However, it is not possible to guarantee that these banks actually bought Bitcoin.
If it is possible to withdraw currencies to wallets, I think it is a good adoption and better than centralized exchanges that do not guarantee anything to customers, with a high possibility that you will be scammed.
Where you got this information? Union Bank doing there business on Bangladesh and bitcoin is still illegal on Bangladesh so it is not possible yet to accept bitcoin trade on Union Bank. i am not sure they can accept bitcoin trading Because i didn’t get any news about it. before posting a new information you should post a source link where you got the information.
Different bank branches in different countries adhere to the standards of those countries, you may find that they accept the service in one place and reject it in another place according to those standards. This does not prevent the Philippine branch from providing the cryptocurrency service and that it does not exist in Bangladesh.