Banks are finding all means to always be in custody of people's funds. Banks like to be in charge of holding peoples money and using in for business. They have seen that bitcoin wants to deprive them of this, and it will make them  run out of business in the nearest future. This is why they have started coming up with motives of accepting crypto trading so that you can buy your bitcoin from them and they will claim that banks is the safest place to store your coins. This will give them the power to be in custody of many customers crypto assets. Trying to turn bitcoin as if it is safe in a centralized system. Also they are business people and they are after profit making and not putting customers interest first. It is good to see banks accepting crypto trading but so many people that will buy bitcoin through banks might end up not being in self custody of their funds.