https://cointelegraph.com/news/german-researchers-child-abuse-content-found-on-bitcoin-blockchain-users-must-be-protected
The reason on why bitcoin is currently banned in some countries in Asia due to its nature being decentralized. People would utilize the the dark web in order to gain access to covert data, things, or videos. Since the government has scarce resources to track down illegal transactions happening under the dark web, countries would just ban the utilization of bitcoin as a 'band-aid' solution to this ongoing conundrum. But if the government found a way to decipher information in the block chain, this may imply that bitcoin may be regulated soon.