[mbesto]

My favorites are Taboola and Outbrain who basically do this as a turnkey service. They've both received $99m+ in funding...

As as a user, I've never seen these as remotely valuable.

https://www.crunchbase.com/organization/taboola

https://www.crunchbase.com/organization/outbrain

[dredmorbius]

"Favorites" in what sense? As in "favorite to hate"?

I block both within CSS (I use a stylesheet manager) and may well block the hosts / domains they feed from.

They're absolutely worthless.