The Deep Web is much larger than the known internet, since it is not only used for illegal acts, but also serves to store documents, which must be shared only with certain people and in a secure way, therefore, the amount of Information that exists on the Deep Web, is really enorm, it is there where the Btc intervenes roughly.
Due to the security and anonymity offered by cryptocurrencies such as Monero, Zcash or Litecoin, for several years they have been used to carry out illegal transactions, since being decentralized, locating the people involved in a transaction is really complicated :0
There are some rumors about totally anonymous and decentralized cryptocurrencies that are used to carry out transactions in the DW, however, it is a complete mystery, since if it exists, its developers would make it known only to the public who is interested and not to all world, therefore, it is almost impossible to get information about it.
Bad habits that turn out to be normal, do not be alarmed, I usually reflect with the information I write, take a tea and buy some cryptocurrencies.