The question of publisher vs platform is a question of who should be sued for bad speech. If Twitter / Wikipedia is legally vulnerable for bad claims, such as

The question of publisher vs platform is a question of who should be sued for bad speech. If Twitter / Wikipedia is legally vulnerable for bad claims, such as by Rush Limbaugh, then Twitter would feel incentivized to remove such risky individuals from the platform. If Rush Limbaugh were held responsible for his statements, he may feel poorly about freely disclosing his narratives.