I began to study this issue, and found a lot of information that users of Bitcoin mixers can really get in trouble ... why not just use coins that specialize in anonymity?
Buy/sell privacy-oriented cryptocurrency is harder than buy/sell Bitcoin, few country such as Japan which legalize Bitcoin forbid privacy-oriented cryptocurrency.
Additionally, not everyone have serious privacy concern, some people even only see Bitcoin as investment.
Besides, many privacy-oriented cryptocurrency doesn't force usage of private transaction/address which significantly reduce privacy of both non-private and private users.