Unfortunately those who buy from illegal online pharmacies are often digging their own graves, too - that's part of the reason governments are cracking down on them. The incidence of customers receiving medication that is at best ineffective and at worst actively dangerous seems to be quite high.
I can tell you that I have been filling prescriptions from India for 20 years. I always buy goods advertised as being the products of manufacturers which have been FDA inspected and approved for the manufacture of generics for sale in the U.S. market. I also always test the goods delivered. In 20 years I received fraudulent goods on one occasion. It was not hard to discern, because most medications have a distinctive packaging, taste, odor and texture. For purified substances a melting point test is extremely easy and effective. For custom syntheses in bulk, I spend 600$ and 300mg of material to get a broad range of NMR spectrographic results which are more than adequate to discriminate even analogs and isomers. It is cheap enough so that if you get bum goods, you simply discard them, and order again from another vendor.
Yes, you can suicide by recklessness. Don't do that.
Another bad thing you might do is act as a tax donkey for captured corrupt regulators and pharmaceutical price gougers extorting the infirm and elderly, and indeed the nations, into bankruptcy. Don't do that either. It would also be bad.