You are speculating too many steps in advance... so first of all, we already know that some governments may well be skeptical of mixing services, but then if they create some laws against such mixing services, then it is likely that some kind of a consideration would need to be made in regards to the language of the law.  The same is true when there is an enforcement action that takes place, then there still could be questions regarding what is the conduct that they are proclaiming to be illegal.. is it the creation of the mixing service?  is it the general use of the mixing service?  Is it the committing of fraud or the knowing allowance of others to commit fraud?  How about advertising such service? or talking about such services?  is it illegal to advertise or to talk about such services? 

Those are different categories of things that would have to be included within such government action that you are proclaiming to potentially be illegal, and then there is another question regarding the extent to which a forum (or a website service provider) might be held liable for the conduct of its users versus its own conduct.. and when you are referring to governments, there is no world-wide government or entity that necessarily would have jurisdiction over all of the world or all of the conduct, so there could be some questions about whether a government entity could either request the shutting down of some services or request the offering of such products be discontinued, and surely we have seen that some jurisdictions (such as the USA government) do attempt to engage in broad reach of their jurisdiction (which some folks label as overreach).

So merely having vague and general proclamations by governments that mixing services bad or some other bullshit would not necessarily automatically either cause people to stop a certain kind of behavior, such as offering a service, or to even give up upon finding some way around it or even to potentially fight against any kind of government taking that might have had occurred - which is one of the things that seems to be boiling up around some of the USA banking services (or even some of the regulatory agencies such as the CFTC or SEC) recently (maybe we could characterize some of these matters as "operation chokepoint 2.0" as Nick Carter and some others have labeled it) in which there are some claims and even potential legal actions against USA governmental regulators in regards to a variety of the lack of due process practices that some of the entities are following, and even in the USA, historically there have been due process rights including that agencies are supposed to either be following mandates that they have or they are supposed to either engage in their own rule making with opportunities for the public to respond or they are supposed to follow clear guidlines, and there are quite a few questions regarding the extent to which various agencies are following procedures that they are supposed to follow and the mere fact that they might have gotten directives from persons higher up (whether congressional or executive) may well not save them from their requirements to follow the law, even though we are seeing that stupid ass desperation seems to be part of the various formulas too.. in regards to the status of the dollar, scares about bitcoin and "crypto" and sometimes these fears are framed in terms of vague categorization of "national security interests," terrorists and criminal money launderers, or protect the children or some other things that may or may not be part of the actual factual foundation.