From all other countries, in Sweden that wanted to push out the cash money to digital form, we see this kind of behavior.
Reasons could be in the bank itself. They could be protecting their self against crypto or don't want to deal with unregulated stuff.
Either way they invested a lot of money to push out most of the cash flow to electronic state.
Maybe you pinned the real cause. Look, from what I am hearing, in Sweden they have a very deep penetration of services provided by credit card giants: even the beggars and homeless people have the card terminals, and people look at you really strange if you attempt to pay cash even to buy everyday things. So they have an even bigger incentive to oppose bitcoin than in other countries.
Look - for banks and their friends (visa or mastercard) it is not the share of market they will gain or not, like in other countries. They have already eliminated cash. It is rather a share of market they will lose if bitcoin wins. And losing is more painful than not gaining.