He has been laying the ground work for this since at least last summer to hedge against an election loss. He has been sitting baseless accusations about mail-in ballots, solve he knew Democrats would be more likely to vote by mail because they took the pandemic seriously. What was the "stop the steal" slogan supposed to accomplish other than create the overthrowing of the legitimately elected president? If he had legal ground he wouldn't have needed a slogan, but just won his court battles.

The fact that there even is a discussion about whether what he's saying really is sedition is enough. They're a private company, that just opens them up to way too much liability. It's not their responsibility to be a platform for all sides, for better or for worse

listen to his speech inciting his followers to go to the capitol. You can decide if it’s sedition or not, but the end result is undeniably an insurrection, and his words are what directly invited them to do this.