How To Respond to the Great Deplatforming of 2021

President Donald Trump's response to last week's attack on the U.S. Capitol led Twitter to permanently ban him from its platform, and Facebook and YouTube closed his accounts on the grounds that he had used their platforms to incite violence.

Then Apple and Google banned Twitter competitor Parler from its app stores, on the grounds that the perpetrators of last week's Capitol riot used it to coordinate the attack and because the service lacked adequate content moderation. Next, Amazon, which owns about a third of the global cloud storage market,...