Which kind of bank transfer are you talking about? A few days ago I got paid through ACH transfer and the transaction took 2 business days to execute, albeit with no transaction fees. Now I'm at the mercy of the bank regarding what I can do with that money.
Compare that with using something like UST (Terra), which took only ~1 minute with a fixed fee of ~1 UST for a similar transaction. I also have total control over my money.
SEPA (instant) transfers between European banks are, as the name suggests, instant. There are also no transaction fees for the users of these transfers. e.g. all major Belgian banks support SEPA instant, so transfers between KBC <-> BNP Paribas <-> ING etc. are instant.
> Now I'm at the mercy of the bank regarding what I can do with that money.
This is going off-topic, but you are with crypto as well. Unless every merchant you use supports your cryptocurrency, you're going to have to convert it back to fiat.
Internationally, between currencies? The best offer I've found for transferring $200,000 USD to AUD is 0.4% ($800). At scale, that's not exactly cheap. I'm referencing the original parent comment which suggests it's possible for fractions of a penny, as I would love to find this service:
> There are a ton of alternatives that cost fractions of a penny in transaction fees.
Compare that with using something like UST (Terra), which took only ~1 minute with a fixed fee of ~1 UST for a similar transaction. I also have total control over my money.