I am not sure of the law stated by Bank of Bangladesh or Bangladeshi authorities about banning crypto or Bitcoin.
The news that you show here is July 29, 2021, in my opinion that news is out of date, I see Bangladeshi authorities implementing rules and laws that change every time against crypto users, the proof is that I saw the latest news February 2023.
Link:
Best Forex Trading Brokers in BangladeshIs Bitcoin available in Bangladesh?
Bitcoin is available in Bangladesh, which has an extensive peer-to-peer network. The popularity of cryptocurrencies has started to attract international cryptocurrency exchanges to Bangladesh. Traders can also take advantage of cryptocurrency CFDs provided by their Forex brokers.
Fact, Bitcoin and crypto users in Bangladesh can still use Bitcoin and can buy/sell.
conclusion: yes, Bitcoin is legal in all countries.
It looks like there is no law that explicitly banned the use or trading of cryptocurrencies in Bangladesh. The government might restrict it's agencies from dealing with these virtual coins but the citizens are not restricted from buying or selling them. There are many exchanges operating in Bangladesh and I am sure they have the licences to operate issued by the government. Since it is not a criminal offence to use cryptocurrencies according to the law, the government is just trying to regulate it's use and not necessarily criminalizing it.
Most of these government officials just base their decisions on hearsays or rumours. They are not willing to study and understand the Bitcoin space, they just copy and replicate policies they get from most these international lending organizations. If they are openhearted to learn about this innovation, they will be able to comprehend that Bitcoin has the potential of freeing them from the financial oppression and colonialisation of developed nations.