Bangladesh Banned Bitcoin [BBB] because
1. No rules formed to Regulated CryptoCurrency.
2. Bangladesh Currency may loose value in front of USD.
3. To avoid Black money getting out of Country.
4. To make sure there is no outside illegal Money entering
     Country.
Further Bangladesh should not note that, they are throwing their Blockchain Developers under it's wheels instead of creating friendly environment for Developers.

In India same situation persists so some Blockchain Developers have already moved out of India, which is a major setback for Indian Crypto community.