I'm sure those ads are for pill-mills (similar to chat-based "therapy" [1]) where you chat with a licensed MD (probably receiving kickbacks) for 5 minutes and get a prescription for those substances.
Hims will take you through a consultation and write you a prescription, it's very well regulated, AFAIK. We (Numan.com, a provider in the same category) certainly are, often, by multiple regulatory bodies.
right across the border in Mexico there's a pharmacy literally at every corner near San Diego, and no prescriptions are needed, you are correct.... The one at stopped at the lady let me know that she was watching the show Breaking Bad on the TV behind me... she was old and asked the other lady to get out of the store before we started doing business... she would not sell me Fentanyl though. She would only sell oxys, percs, and other stuff. I didn't buy anything though.
You’re not getting what you think you’re getting at those pharmacies though. They’re just selling labels of what Americans will buy and filling the vials with whatever they can find. The reason even pretending to sell fentanyl is off limits is because that puts them in competition with real drug dealers (even if the fentanyl is fake) which is incompatible with life.
A bit different though, as those are legal. OP article is about illegal / Schedule I sales.