Indeed - and a glance at the ads on even mainstream sites sure back that up. They're mostly shilling casino mobile games, scam tech (like 'portable air conditioners' that are just a fan that blows over a wet sponge for $75) and the big one, unregulated dietary supplements sold with disgusting imagery and "One weird trick" ad copy. It is almost entirely just utter bottom-feeding trash. And this is what's paying the bills for 'reputable' sites like CNN, Bloomberg, CNBC, whatever.
Perhaps it might be accurate to say that as email has declined in popularity, “spam” has simply moved to the Web.