The fact of the matter is Jones directly claimed that Sandy Hook parents were government-sponsored actors and this lead to a 5 year long ongoing harassment campaign from Info Wars viewers towards the parents of the murdered children. Two parents who are involved with the defamation case claim that they have had to move 7 times in total due to the excessive amounts of harassment and death threats they receive, finally setting hundreds of miles from where their son was buried.
A second defamation case opened against Alex Jones was when Info Wars published a photo of a man, Marcel Fontaine, on their website who they wrongly claimed was the Parkland shooter, which led to him getting a profusion of death threats and targeted harassment. Only problem was Mr. Fontaine lives over 1,000 miles away from Parkland.
This isn't really a case of free speech anymore, this is a case of what if he's claimed has definitively caused damage. I don't see it as unreasonable for these platforms to push Jones off of their websites.