Bitcoin and blockchain are awesome technology but it is being most used in gambling , betting , casino, all bad fields is this what making many countries step back making bitcoin and blockchain tech making legal or creating negative impressions for people using this technology
maybe the reason could be a strong reason for the government to ban crypto currency, but in my opinion, the bad development of the crypto currency depends on the intention and purpose of the investor itself.
That's the reason why the government now implement a KYC on most web wallet or apps wallet in storing Bitcoin so that they would know and trace the possible suspicious transactions. All systems that related to technology might be used on the negative side not only Bitcoin, but negative sides were also always there even fiat currencies, you can still used them buying illegals stuff. We know that time to time Bitcoin will become a good technology and it will keep spreading on every country.