In order to exist, cryptocurrencies don't need banks.
Actually, for me, the fact that they allow to circumvent banks is the most appealing feature of cryptocurrencies.

Currently cryptos are not mainstream, their acceptance is extremely limited in the business world.
Until today, cryptos are a world mostly limited to traders.
Being used by recognised banks insert them into the banking system, giving them a substantial boost to become mainstream currencies.
That's the way this world is.

For now, I guess you have to choose, either mainstream or ideological purity.
I consider it as a necessary step to get rid of the evil 


Btw, article found also here
https://www.zerohedge.com/news/2019-08-28/worlds-first-licensed-crypto-bank-seen-game-changer-switzerland

Taken from here
https://www.swissinfo.ch/eng/licenses-awarded_-world-s-first--crypto-banks--game-changer--for-switzerland/45187400