It wasn’t “understood”. They all wanted to stand on the dais. They all unbanned him from the platforms. They all threw their weight behind him as a candidate.
They are supporters of his. The whole “boo hoo, I only run a trillion dollar company so I cannot stand up to Trump” is a horse shit ass, bitch ass excuse. These people have more access to wealth, legal help, and other resources than any other people in history. They chose this.