If a person contemplates assassination, kidnapping or any crime that exists, if it is done over the telephone or the cellphone or by mail, through a crack in the wall or though any means of communication, it is a illegal act and it is the act that can be investigated and prosecuted.
Accusations that have a shaky grounding have been made that Trump instigated the events at the Capitol. Those are simply insinuations or more properly described slanderous accusations. These slanderous accusations are common in our present. But they do not hold up to a fair-minded analysis.
The reason therefore that Trump has been banned are because people and institutions and government do not like his ideas and do not want him to be able to communicate his ideas. It is that simple really. And it is that obvious.
It's not that simple or that obvious. When he tells his followers that there is a vast conspiracy, involving the DOJ, FBI, VP, many states, governors, secretaries of state, the SCOTUS, courts in many states and more, and that these actors deliberately defrauded the entire nation by stealing the election from Trump, it's a call to revolution, insurrection, and it's all based on LIES.
Those coming told us that was the plan, they told us they planned to use violence, and instead of condemning that Trump egged them on. Even if you can say he didn't tell them to engage in violence, which is true, violent insurrection is in fact a RATIONAL response to those who believed MONTHS of Trump's lies and his deliberate effort over many months to undermine elections and the peaceful transfer of power.
All of those or any of those are sufficient to impeach the President, and if Twitter et al. want to remove him from their platforms, the CONSTITUTION provides them the right to do so. He's feeding the members of society who tell us they want violent responses to the fraud Trump insists happened. It's the equivalent of building a giant bonfire, putting the wood in place, the kindling, the paper, then pouring the gasoline all over it, and then being SHOCKED, SHOCKED I tell you that someone lit a match.
So the "ideas" that people and institutions (not government...) wanted censored are LIES that fed what we saw this week, and there is still an inauguration on January 20th, and from what I've seen the same forces are promising a return trip on that day, to again disrupt, perhaps violently, the transfer of power in this country. You cannot be surprised that some private entities censor that speech. We should all condemn it and it's within the RIGHTS of private businesses to not provide the oxygen for POTUS to spread what are simply lies.