If I were in the moonshine business it would be my goal to have customers return for more of the same.
Poisoning your customers would have to be a mistake in the production.
I have read of similar cases such as this in India.
Horrific as it is with the deaths and life changing to the victims I can not see this is intentional.
Drink a bottle of Johnny walker rapidly you could die of alcohol poisoning.
Life is full of risk, booze and drugs only increase the odds.