The critical link
It that Facebook was unwilling so far to block the domains they were using to bury their abusive links. Those services are largely unnecessary for page navigation and rendering. The industry is mostly built on shady operators juggling link clicks around to pump up their ad auctions.
We really SHOULD just blackhole these outfits, which will inconvenience legitimate operators, but knock out whole tracks of bad actors. An internet without these companies would be a better internet.