we all know how CBN of most countries want to be incharge of every penny that is spent in their domain, and Bitcoin doesn't give them that privilege of such luxury, so to them it's not an entirely a win win situation for the government giving their authoritative nature.
Central Bank (CB) is the right term, and each country has its own official name for it. The CBN is associated to the Nigerian Central Bank, while the US call theirs "Federal Reserve System (The Fed)" and so it varies in other countries.
You have a point here, but should the government legalize Bitcoin solely for the purpose of taxation?. The issue with governments that oppose Bitcoin is as a result of ignorance and a lack of interest in understanding what it truly defines.
Take El Salvador for example, we've witnessed the country's enthusiasm towards Bitcoin and how they've implemented strategies to promote its adoption, such as using geothermal energy for mining, introducing educational programs in schools, declaring it a legal tender, etc. El Salvador is not just aiming to make profit from Bitcoin taxation alone, but also from the things they've put on ground such as mining programs and others.
So, what I am trying to say is that if an anti-Bitcoin government decides to legalize Bitcoin solely for tax purposes, they should integrate it fully into the country's system, just as what El Salvador has done. At least, more tax revenue can go to their selfish pocket.
Let us take a look at El Salvador, they did not just jump in for the tax money, they went all in. First they made it legal tender which is why the president is referred to as the first Bitcoin president. After that, they build infrastructure around it, even started mining with geothermal energy and added it to the curriculum in schools for kids to learn. This shows their interest in it.
So the thing is if a government wants to accept and implement a lot about Bitcoin then the =y should do it properly. Fully integrate it into the economy and actually support the ecosystem just like El Salvador did. Even if they are doing it for selfish reasons, at least it will still benefit them and the economy will row.