It should be noticed the reasons why bitcoin and other digital currencies are not central, so any exchanges doing with cryptocurrencies forms of money should be finished with a dependable source, in other to get rid of such issue.
Not all because there are other coins out there which can really held off such transactions if they wanted to. Not all coins/projects in this market is totally on that decentralized side of things.
Tracing up bitcoin might not be possible for other or they do believe on that but there are some exceptions or situations. Ex. Take a look on what CipherTrace been doing when it comes
to tracing transactions? Some are indeed found on where those coins originated from and where it did able to land.
Even though its been traced or known but reversing transaction is really impossible.