It wasn't until recently that governments (arguably) became good at using technology to physically regulate banking activity, and it's only because the financial system became centralized enough for them to gain visibility into what was going on. Before then, and - to be honest, even now - government regulation was operationalized through the threat of repercussions and consequences for non-compliance.
Aside from reducing visibility into the transactions themselves, I don't understand what, exactly, DeFi or any of the other acronyms for ledger based systems do to stop this. Does DeFi, crypto, or whatever it's being called at the moment make it easier to avoid government oversight? Sure, but if you are doing something illegal in the process and get caught, there will still be legal repercussions.
> hard to transfer LARGE sums cheaply... fees are sometimes very high as well. Example tried to convert one currency to an other 1% fees in europe. I think you would pay less in a DeFi setup.
Is this still true? I'm pretty (very) sure that Interactive Brokers and other platforms allow for extremely cost effective currency transfers.