Firstly, in most cases Bitcoin isn't actually banned, but just the practice of exchanging crypto to fiat and vice versa.
Secondly, governments missing out on taxes is just nonsense. If there was no crypto, there would be no additional crypto tax income for governments, so what exactly are they missing? To add; them getting rid of crypto actually makes them lose out on additional tax income. If you regulate the market as government, you WILL get tax income from crypto. It might not be that all people suddenly start paying tax, but what's better, 20% of the crypto traders pay tax or 0% of the traders?
People here need to accept and understand that people in developing countries are mostly poor for a reason, and will remain that for a reason. They aren't supposed to progress further. Poverty, just like debt, means you as authority effectively control everyone fitting in these categories, and let that control be what authorities desperately plan to hold firm.
But government could turn the tides with that situation. They could use cryptos at some point that they'll be making an investment program where poor people could invest into crypto with their support by cents or few quarters to start it up and let it grow for a while. It is not the real thing to make them grow their economic status but it could help them slightly to moderate.
Bitcoin is developing a new currency because of people use it and invest and we can see the the price is good so the people like a bitcoin and if many persons invest a bitcoin the bitcoin will grow up and many persons know it and become popular so that in the future bitcoin will popular and bitcoin use in people on daily needs to buy.