Which bank are you referring to? If this is really happening why don't you show us a screenshot of your banking app that has it up where customers can buy Bitcoin? I do not find this easy to believe I am sorry for saying this.
and even if this is true we all know that bank are businessmen or the business entities that are here for making more money, so if anyone is buying crypto through Banks they should know that those banks are making money out of them one way or the other.
You need to ask yourself what are the banks benefiting from selling crypto to their own customers it doesn't make any sense, It is also very risky to buy crypto through banks because now they will know that you are into crypto investments yourself and even in future, if the government decide to start going after those that are investing in crypto it will be easier for them because believe me the banks will betray you easily.
I don't have a screenshot because, as I stated - I was working at a company and had authorization to access their bank account including the e-bank app from my work phone. It's not a secret, the bank in question is from Lithuania, I can't remember the exact name of it right now as it was a few years ago.
I do currently own a business and have an account in a Magyar bank, but they do not offer such exchanges/investments in Bitcoin.
I'm also presuming most of the forums members are from the US, I don't know if these services are a thing there, but these banks are clearly offering this in Europe.
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As far as I know, the banking operations are limited to providing financial services to its customers. For investments, they usually offer services on different platforms, but usually in one group. I don't know how the regulations are in your country, so that your bank can offer Bitcoin investment services directly from their application. Because as we know that banks and bitcoins are 2 things that are quite contradictory and most banks around the world are against the adoption of bitcoins and it is quite surprising that your bank offers Bitcoin investment services which are not their domain.
The thing is, the bank isn't in my state (as the company isn't), so I don't really know the regulations. Maybe they were using some exchange powered by themselves or some associate, who knows. I'm sure they just want to get more money in any way possible.