While somewhat concerning and disappointing, that alone doesn't justify the degree to which you are freaking out.

They are registered with FINTRAC as an MSB, as we all know.

Using a mailbox as a business address is not unusual in Canada, as was also pointed out to you.

The fact that anyone can register with FINTRAC, even you, doesn't mean you will meet all the obligations and remain a 'member in good standing' if you will.