Sure, but you cannot control what someone does with their newly acquired money...
So if someone gets "tainted" money from you and deposits it in a CEX/bank (some people want to liquidate BTC for fiat, or buy instantly BTC with fiat), then you should expect a call.
But, how will anyone know who I am. Perhaps you mean if I buy something online. Well in that case, I will just lead the "interrogators" to the address that sent them to me.
Not necessarily online.
Do you live in the real world? If so, you've probably made physical transactions, arranged appointments and this usually involves phone communication (so they will have your number).
When a police officer asks where you got that money from (that's what I mean by interrogation, not beating you up), you will have to reveal his phone number, even if you don't know his name/surname/address.
Phone numbers/SIM cards aren't anonymous since 2009 last time I checked.
In general, if we buy the whole "tainted bitcoin" idea, then we deserve the strict banking system that we currently have!
I don't like the banking system. It is what it is.
But how are you going to fund your debit card? How do you pay taxes? Do you use banks in general?
Regarding "tainted" BTC, I prefer to let the free market decide.
From what I've heard, there are people who are willing to exchange "tainted" BTC with clean coinbase outputs for less money than its' actually worth.
If people are willing to get rid of it for a cheaper price, then who am I to argue with them?