By that logic, Binance, Huobi, KuCoin, Kraken, Gemini, Coinbase and every other exchange is a mixing service. An example – the stolen BTC from the Twitter hijack scam last year was sent through multiple transactions and exchanges to obfuscate the sources and destinations. Since those exchanges were used as ad-hoc mixing services does that mean they should be consider mixers now?
Just because a protocol or exchange can be misused as a mixing service does not a mixing service make. Intent of the service is a predominate factor. The designed intent of Bitcoin Fog was coin mixing & obfuscation. Furthermore Bitcoin Fog was heavily vested in facilitating BTC transactions for Silk Road and other darknet markets. It was this predominate use that brought attention from the IRS.
Coin mixing is not a design goal of Incognito. The privacy features of Incognito do not rely on coin mixing. The privacy features of the Incognito protocol result from the ecosystem of pToken/pAssets and the pDEX. That someone could use the privacy features of Incognito to mix coins is – at best – a byproduct of the protocol, not a designed intent or goal of the Incognito protocol.
While it is good to stay abreast of news like this, there is no reason to make comparisons and/or connections that are undue if not wholly unwarranted.