Even if corporations were to pre-emptively ban all speech that threatens to undermine the public faith in our elections, there is still a legal system which all

Even if corporations were to pre-emptively ban all speech that threatens to undermine the public faith in our elections, there is still a legal system which allows for complaints to be heard fairly. For all practical purposes, "How many people can you broadcast your message to" has effectively zero bearing on the strength of your legal case. Therefore, I don't see how banning seditious speech opens up an avenue for someone to actually steal an election.