The deplatforming/restricting of stock purchases by brokers is a direct expansion of the deplatforming/censorship first carried out by social media and payment processors against the Alt-Right. Anywhere the establishment is threatened, Big Tech steps in to maintain control.

When Tech companies first started out, they were "disruptors" of establishment control and embraced the libertarian idea of giving people greater freedom to do whatever they wanted on their platforms. Those days have ended and probably won't return.

With their monopoly control over the marketplace (be it ideas/information or financial) Tech platforms unilaterally act to ensure the ruling class wins out. They have become the new establishment and act like it.

We will see more examples and new areas of Tech deplatforming wherever the liberal center sees a threat to its hegemony. Antiquated American law based on a centuries-old paradigm where only the Government had the ability to infringe on civil liberties will provide no restraint.