Seeing how vague cryptocurrency regulations are on some parts of the world, I can see this happening within a mile. Those crypto services that got lucky into securing a bank account and getting financial services for their companies are situated within regions wherein the idea of cryptocurrencies are not frowned upon. If cryptocurrencies gain full support from governments, I am quite sure that banks would follow where the money is. They are just scared of getting screwed up by hacks and loss of profit that's why they aren't taking a bite on cryptocurrency services just yet.
I'd have to agree with you mate. Just check out what has been said in the article:
Alameda Research CEO Sam Bankman-Fried told Bloomberg that banks would rather deny banking services to cryptocurrency companies as they do not want to get involve in cryptocurrency-related compliance issues.
With how messy the regulations are in relation to crypto, banks have decided to steer clear from the hassle of compliance that comes with crypto. Since that crypto is not yet fully supported by the government, they may encounter problems with authorities. A bank would of course go with wherever there is money and profit. Even while crypto has been gaining revenue, they won't take that risk.