I think there's a difference between transfers for sustenance, i.e. retirees, people working in negro sending a couple grand a month, tourists living here technically illegally, etc. and people sending 10K, 15K+ USD at once/multiple times for large purchases, the later I believe is what sets off alarms.
The WU forum goes back to Oct 2019, and while I haven't read all of it of course, the only time I recall anyone having issues was someone who used them to transfer money to buy an apartment? and another for trying to transfer 10K back to back basically with their wife.
All this being said, there is actually an incentive for people to use WU as opposed to other means of sending money legally to/from Argentina in the government's eyes, and that is due to the fact it uses some version of the CCL to trade dollar for pesos amongst people without touching the BCRA's dwindling reserves. i.e. when a forum member sends their social security check each month, that's dollars WU then sends to Venezuela or Senegal which the BCRA doesn't have to give up, and that makes the BCRA happy.
As always, I'm not a lawyer/nor do I claim to be one, but what I assume the lawyer is getting at is the people that work in negro and collect their salary via WU. If you're sending your savings from abroad here, or family/friends are sending you money to help your cost of living, I'd argue you don't have anything to worry about, because if you were denounced to the UFI, you could clearly demonstrate that you are adhering to the letter and spirit of the law.
Again, as always, I'm a broken record on this: if you're going to work in negro abroad please pay something to AFIP, because that's what they care most about at the end of the day.
