M.P.
Are you saying that they buy into other people's policies? I don't understand how they could do that. Perhaps you're saying that they make payments for the other person and then they are repaid when that policy pays out (the person dies). That is a business arrangement between themselves and the other person. Sounds weird but not a scam if it's an agreement made in good faith.
As far as borrowing from their own policy, I don't see how that is a scam or even a problem. They are borrowing from the money that they have already put into the policy. And they are paying a penalty which means they've lost the amount of the penalty. If they should die then the amount they have borrowed will be withheld from the payment.
They have paid $50,000/yr into an insurance policy worth $2-3 million. When they borrow, they are removing that amount from the amount they've already paid. It's their money.
After your SWH. It is their money and their business how they spend it. No one will have to pay anything because the amount they borrowed will be deducted from the pay out of the policy. It is not a debt to be repaid by someone else. It's their money. It does mean that their beneficiary will receive less money. Are you a beneficiary?