We can argue all we want, but it is clear that in 2016, blocking one Twitter account could alter the course of history.
In my country there is a political party that has been excluded from a lot of public things, other politicians telling them they are fascists, racists and just any kind of slur basically. They were even excluded from a party where Saudi Arabia was invited. Just think about that.
Now, they are the second largest party in the country and well on their way of being the largest. They had everything to gain being the underdogs and their opponents has been their best ad for gaining trust and votes.
Trump has been a brand for an upwards of 50 years.