To be slightly clearer, what I mean is that in, say, the mid to late 2000s, most of the spam email I saw was inducements to buy fake or generic or otherwise illegal prescription drugs.

Nowadays, by volume most of the spam I see seems to be trying to get people to sign up for trading "secrets" or algorithms or free pips, largely focused on Forex markets.

I wonder what changed in the world of weird spam scams to make the content shift in that way.