...
Some of the methods are not "illegal" and I will take an example. I buy 50 items at a reduced prices from a Bitcoin merchant
and sell it for Fiat currencies. If you bargained for a good discount for bulk purchases, you might even make a profit. You
could also pay for a friends dinner at a merchant that accepts Bitcoin and that person can give you the cash. These are
simple examples, but they are ways to get around Banks. {This might be a much slower process, but you will never be
stuck with those bitcoins, because the Banks wants to sabotage Bitcoin.} The same goes for the Banks that sabotaged Bitcoin
by not allowing people to buy bitcoins with their credit card. I use the credit card to buy something else and sell that item
for cash and I buy the bitcoins. Problem solved. {There is always a way, not the easiest... but it is still possible}
I see now where we have the disconnect. I am not talking here about amounts that can be used up on an occasional dinner, but amounts with which to finance your life (i.e. as a regular, decent income) or as a large lump sump.
Take the later, and let's make this concrete. Assume you were lucky enough to have bought sufficient BTC years ago, so that you have now the equivalent of USD 10m sitting in your Coinbase account. You decide that this is more than enough to live on and quit your job. You still will need to use cash (or fiat) to pay the rent, continue shopping where you have been shopping so far and at shops that don't (yet) accept crypto currencies, or you might decide that you want to buy yourself now that Lambo you were dreaming about. What now? The Lambo dealer might only accept hard currency, and not bitcoin. Your landlord, grocery store, tailor etc. the same.
My guess is, you will not be able to get to your money without involving a bank or some finance institution. And unless they are of shoddy character, and unless they are already used to seeing millions being moved in and out of your account for other legitimate reasons, such transactions will raise alarm bells.
Also, the example of the credit card to get cash with which to purchase BTC is fine, except you did not say how you move the cash to an exchange to buy BTC. Ok, for small sums you could do a physical transaction at a local meet-up. But larger sums, and regularly? Again, I don't think there is currently a way to circumvent banks. Either way, moving money INTO the cryptomarket is less problematic. Moving it out again, however, still is.