AFAIK it was from the last year where Nigerian Bank will confiscate any money related with Bitcoin, so nothing surprised here. If the bank don't want to accept any money related with Bitcoin, what you can do is trade via P2P and increase your security level in order to hide from getting tracked by your government. You can also move to the other country which is friendly with Bitcoin.

Do you have any links to back up this claim?
Based on your post histories, I believe you are a Nigerian, and as such, you are referring to the Nigerian government. 

So far as I know, the government only asks the financial institutions to disengage from every crypto transaction, even though the government has not made it official that they should track down every crypto account. They are against crypto, but they have not yet made it public that banks should trace all crypto transactions. That does not mean that we should make our transactions known to them that they are crypto-related. 
The government has always been against crypto, and Bitcoin looks like a trait to them. and not them being a trait of bitcoin. 

When it comes to the Nigerian government, I believe they are just looking for a way to earn from the crypto industry since they still don't have ways to do trading and involve themselves in it, which is why they are stopping banks and other financial institutions under the CBN from disengaging from it. 

In fact, what the government fears is that people will not pay taxes, but if unemployment increases and production decreases, or people find a way to hide their money so that their taxes are zero.
The rich have a lot of tools that make them reduce the amount of tax they pay to a very small amount, but it is the simple citizen who pays all that cost.
Cryptocurrencies have been a way for many people to reduce their taxes, and therefore governments will deal with them in two ways, either by banning them or trying to tax them.
The semi-secret nature provided by these currencies forces governments to stop any method of enhancing privacy, including the war on mixers.

I would put it a little differently, the OP belongs to the Nigerian local section. In addition to the fact that many have confirmed that this is an old topic, besides, why not discuss this topic directly in your section, where people directly understand the tragedy of the situation?
The title of the topic looks very general, but you need to understand that the situation with banking systems in different countries is different and who, if not a person directly belonging to the country in question, will be able to answer correctly.

Peer to Peer trading is good and bank transfers for payment between two trade partners does not have information related to Bitcoin or cryptocurrency trading.

Problems only rise if you are trading with a scammer and when you win and exit that scam, the scammer can submit a report to banks as his personal attack against you. I don't know how banks in Nigeria can get information about bank transfers related to Bitcoin and cryptocurrency. I really think that they have to depend on reports from users together with other authorities.

How will Nigerian banks handle those reports from their users?

Screenshot from a trade means nothing as it can be faked easily.

When it comes to the federal government and banks, a threat has existed for a while. They have tried several methods to shut down Bitcoin, but it has been an impossible task to get control over it. I also recall that, some years ago, the government in my region tried the same policy by instructing banks to forbid any accounts related to cryptocurrencies, and police began to harass those who were involved in it. Despite all of this, cryptocurrency is still growing steadily.

Currently, my region has some of the largest Bitcoin investors, and occasionally I get the impression that the majority of these government leaders also own Bitcoin. To this day, I still don't understand why they want to outlaw Bitcoin.

Not really, maybe you are thinking that right now because you are still using your fiat in some way but if we were to theoretically just use bitcoin for payments of goods and services, then there's a high probability that we won't see them as a threat. Not to mention, these banks see bitcoin as a means to grow their money too so until the time that they're still benefiting from it, I don't think we have to worry about them, just be aware but never paranoid.

Bitcoin no doubt gives you privacy but people are caught while converting bitcoin to fiat or vice versa. Its fine as long as you remain in Bitcoin. There is very rear chance the government agencies can caught you while your bitcoins are in your decentralized wallets. We need to keep this in mind that government will crack down hard on bitcoin with every passing day, as its market capitalization and popularity keep increasing exponentially. There are problems for people living in countries which are not bitcoin friendly.

Are you serious? I searched on Google and found that this amount is approximately 5475.119 US Dollar.  Is 5,000 dollars a "considerable" amount in Nigeria, or is the government so strict, or is what happened a "coincidence"?

According to what I have read, Bitcoin is not banned in Nigeria, so the forfeiture order means that person has been accused of money laundering, not because of Bitcoin.

Governments fight anything that reduces the control of the central bank, although the continent of Africa is difficult to control money compared to countries such as the United States and Britain.

Financial freedom comes along with people's freedom to speak and criticize the government and eventually revolt against the government. It's not just about banks. But the government losing its grip on the people will eventually topple the government leader.

If it's happening in Nigeria, it's also possible to happen to just any country today where people have been enjoying the freedom to hold BTC to which they could support or fund an independent leader opposing the president.