Well as we all know that whenever we transact it always go through blockchain first. So is it possible that blockchain can detect illegal trasanction such as buying drugs, guns, hitman etc., especially on deepweb. And where does bitcoin go when blockchain detects a illegal transaction?
No i don't think they moniter all your transaction so there is also no TOS or something in blockchain.info about those illegal transactions. May be coinbase have strict policy as they have banned few wallets already. But bitcoin is mean to be decentralized so anybody can pass through this companies if they use desktop wallet or paper wallet for transaction.