Come to Nigeria and cash out your millions of dollars in crypto without questions ask, but then, you may likely not want to cash out every thing at once to avoid being invited by the bank to state what you do for a living, this is probably nothing, but just to be on the safe side, it's better to avoid anything that will warrant you having to face the banks to answer some silly questions.
And I think as an international investor you are or will be, that's another good advantage, authorities in Nigeria seems to respect international investors much more than their own citizens, an international investor may cash out millions here in nigeria and the authorities will say nothing, or do nothing about it, probably because they assume that as an international person that you are, you must have business in your country paying you good amount, but for a Nigerian citizen, authorities will or may invite you and will want to know how you came about such amount of money (if it's really big).
What about safety? If a foreigner arrives to Nigeria and cashes out decent amount what are his chances of staying alive (if he won't bring his own private army with him)? Then, you mentioned that banks may start asking questions if you start to cash out big amounts. So it means you will be forced to keep your funds in your account in a local bank? How safe is that? Are bank accounts secured/guaranteed by the state?
To your first question, there are alot of Billionaires in Nigeria without security, and they are doing very well, alot of very rich foreigners are living and working in various places and companies here in nigeria, live on exotic places and drive exotic cars, all this without any security guard going up and down with them.
What I will tell you is that, apart from economic problems and insecurity in some areas caused by economic hardship, Nigeria is still one of the safest country to live in, all you just gotta do is live a low key life, since yoh have the money, find a luxury and very quiet estate and live there like you dont exist, and you will be good, most rich men in Nigeria don't make noise
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And to your second question, I think you are misunderstanding what I meant, by cashing out, I do not mean to withdraw all your money from the bank, I meant to withdraw money from crypto into your bank account.
And who said the banks will force a customer to keep his or her funds in their local bank account? I never said such, if you withdraw let's say, hundreds of millions of naira into your local bank account, and the bank said or did nothing, you are free to withdraw your money from the bank anytime and do with it what ever pleases you.