Another big driver, which TFA mentions, is that outrage drives both clicks and repeat visits. There are lots and lots of people in it purely for the money, including Americans. It's nothing political, it's purely the profit motive. Then the reward functions on FB and YT direct people towards content that appalls or outrages, disturbing videos, conspiracy theories, bigotry. For FB the ideal user is one who's been sucked into a vortex of conspiracy theories and spends all their time on FB.
When I say it's apolitical I mean the con artists know exactly who to target, which is the right, because you can feed them anything and they'll keep coming back for more. It's far harder with the left, they'll say "this is all bullshit" and move on quickly, there's no money to be made there. There was a great interview a few years back with a California-based troll who said he targeted the right because that's where you got the responses: "We've tried to do similar things to liberals. It just never worked, it never takes off. You'll get debunked within the first two comments and then the whole thing just kind of fizzles out".
When I say it's apolitical I mean the con artists know exactly who to target, which is the right, because you can feed them anything and they'll keep coming back for more. It's far harder with the left, they'll say "this is all bullshit" and move on quickly, there's no money to be made there. There was a great interview a few years back with a California-based troll who said he targeted the right because that's where you got the responses: "We've tried to do similar things to liberals. It just never worked, it never takes off. You'll get debunked within the first two comments and then the whole thing just kind of fizzles out".
"Nothing personal, it's just business".