What you are pointing to is expressly pointing out that 1) it is illegal, 2) it is illegal for a very good reason, 3) if anyone finds out the illegal things going on, it will likely result in catastrophic (or at least very, very expensive) consequences.
The pretending part that Tether and Bitfinex were doing was fundamentally different than the walling happening within financial institutions, where it has to be disjoint staff, disjoint control/leadership, and if someone sneaks through compliance and shares data (wink wink) it is highly likely someone will get fired if compliance finds out.
In the Tether/Bitfinex issue, they shared board members and ownership despite claiming they didn't in public, and were misrepresenting themselves in a very material way as independent.
If you were just adding some information, apologies. If you were advocating that clear evidence someone is brazenly committing a crime is not a justifiable and strong reason to distrust them, or even that it is inappropriate to hypothesize how they could be getting rich while continue to do similar things - then yikes?
If you were saying Situation Normal, All Fucked Up - then extra yikes?
Goldman Sachs (or some random VC firm) say might have some subtle versions of this going on, but if they were doing what Tether is and has been doing right now, they wouldn't be a solvent entity for very long. That Tether is hiding from jurisdictions (for now) in a way that Goldman can't doesn't inspire confidence in their trustworthiness or stability going forward, as they're clearly on the radar now and blood is in the water. Along with a lot of money and some high profile political promotions, potentially.