I saw other co-forum members that have shared that they're from Bangladesh and said that bitcoin/crypto there is totally banned, they don't want to be against the law and they're just like hiding in shadows while continuing with their involvement in trading and earning of bitcoin.
The latter part of what the Bangladesh said;
No legal authority in the world permits such trading, Bangladesh Bank said.
We all know that there are countries that have permitted it and that's why there are exchanges existing and keeps on operating helping users like us to convert and trade our cryptos to cash and vice versa.