Comment by Aurornis
> They guy was selling a good to willing and aware buyers
In general, high-potency opioids are cut (diluted) with other powders and then sold as a different product to unsuspecting buyers.
Most fentanyl overdoses are from people who thought they were consuming a different, more familiar opioid. Fentanyl and other synthetic opioids like this one are preferred by drug dealers because it's much easier to smuggle a tiny amount of powder and cut it 1000X than to smuggle the real product.
It's nearly impossible for amateurs to properly dilute a powder like this, so the end product has a lot of "hot spots" that lead to overdose.
They're sold as some other known opiod and the dealers typically try to dose them to be equivalent because that's all they're getting paid for.
There is no incentive to give out "free drugs", not least because you might kill an otherwise paying customer.