The platforms are not deciding to be the arbiter of morality, that's just a straw man. They are, however, deciding what they want to see and not want to see on

The platforms are not deciding to be the arbiter of morality, that's just a straw man. They are, however, deciding what they want to see and not want to see on their own platform, which bandwidth/maintenance/etc costs they are footing the bill for, which is perfectly acceptable. They are private businesses, they are not discriminating against a protected class (to cut short any "but what about refusing to sell cakes to gay people" argument), so they are free to ban whatever users/apps/etc they want off of their platform. Hey, maybe if Twitter had banned Trump for some of the crap he said, we wouldn't be in this mess. This is no different from a book publisher refusing to publish your book. Free speech considerations do not apply.