Some banks are not strict when it comes to gambling transactions. As long as the amount is not alarming or too big that it looks suspicious then you won't have any problem using your bank account to fund your gambling activities.
The more dangerous thing based on my experience is converting your crypto straight to your bank account. Banks in my country always flag the transaction if they found out that the source of money is related to cryptocurrency.
If you know about this possible risk and issues for your accounts and money, you will consider of more careful approach by avoiding directly moving your fund between platforms from gambling to bank or cryptocurrency exchange to bank, if you know that they are not too friendly with both gambling and cryptocurrency.
Even they are not against gambling and cryptocurrency, if you are careful, you would consisder a similar careful approach. Prevention is always better than cure, and being a little bit more careful, doing one or more steps can help your fund more safely, so why not?
Being careless and lazy always increases risk and probability of having troubles and losing your fund with reasons at least you can control or avoid somewhat.