Deplatforming is a dangerous step for a free society, especially when so much power is accumulated in a few platforms*
The big risk is this: when only a few entities funnel so much societal discourse or control our communication infrastructure or process payments, those entities making arbitrary decisions about who they serve has similar impacts and risks to the government imposing similar restrictions through the law. These companies should not act as a moral police and should not impose their own personal governance above what is minimally required by the law. Nor should they rely on the judgment of an angry mob to make decisions.
Case and point, take a look at Medium blocking Gab, as referenced in this article. Gab's _statement about the shooting_ is being blocked? That is ridiculous, and unacceptable. And we should not patronize such businesses.
* Spare me the tired arguments that these private companies have a right to not serve customers at will. That seems like self-serving cherry-picking, when in other situations the same folks would be against granting freedom of association.