We also live in a litigious society. These sites have mega billions. When he's posting videos of people harming/insulting people physically, as he did with the video of the man who threw a kid to the ground after arguing over liberalism, people will run out to get a attorney and argue the irresponsible behavior of the corporations whose refusal to remove the videos over profits caused them undue harm if they were similarly assaulted. It's all about profit...not just by these corporations, Alex Jones is also selling something, to maintain his base and income he has to keep upping the bar himself. Competing for attention on the internet can be a tough sell, at some point corporations have to ask themselves how much liability do I want to open myself up to if he keeps upping the bar to stay relevant.