Not just that, but there's no mention of removing ads or tracking. So it sounds like people get to pay for the privilege of being the product on a platform which has degraded to the point of being absolutely useless.
I can't imagine the economics would work to support anything close to what they make from the ads & tracking model. They'd probably have to charge $39.99/month from everyone to compete.
$196.2 B ad revenue / 3.58 B daily users (as the average rate over the year) comes out to < $5/month from everyone.
Of course, the trick is you don't actually get "everyone". You get the users with more money, who are more valuable ad targets. Still, $39.99/m seems like it'd be pretty high.