Perhaps in your country, because in mine those offices or places for people to exchange cryptocurrency for cash are non-existent, mostly because the fer people have to the government of this country to seizing their assets and holding them without a legal reason.
Instead of offices which exchange crypto for cash, we still have physical casinos, which allow people to gamble their chips without a clear and well defined limit.
So, from my appreciation, it is more likely for someone in this country to use physical/brick and mortar casinos to conceal the origin of their money rather than going straight to cryptocurrency casinos, which will almost certainly ask them for identity documents.
Those offices you talk about must at least ask for a minimum of documentation, otherwise they would end up with coins gotten from hacking and theft.