did you know that the $100 and $99change from scenario A is being then scrutinised for where the $100 came from and where the $99 ends up
If you think that you can fool chain analysis companies and regulatory authorities by buying chewing gums, then I don't know what to say.
scenario B is not registered nor required to register, nor deemed illegal for not registering as a money transmitter business. it does not do KYC nor appear on any regulation policy to scrutinise its customers identity or purpose or source or destination of deposits/withdrawals. YET you get the same result as A of different taint/denominations out as what went in
Except from the fact that the taint nonsense continues insusceptible to such moron techniques, due to it being absolutely arbitrary in the first place. If you want privacy in Bitcoin, mixing is inevitable. If you want to "not look suspicious", sacrificing your privacy is inevitable.