He called them 'unsolicited' because he has had ZERO fund raisers, and 74,000 average Americans decided, without being harangued, pestered, called, or emailed to send Trump a small contribution.
What really pisses off the msm, is that 74,000 Americans voluntarily send Trump, whom they know is a billionaire, a few bucks, just to say, "I'm an American, and I WANT TO HELP IN MAKING AMERICA GREAT, AGAIN".
The msm can ESAD!
He accepts small donations because it makes people feel like they are part of the campaign and they are going to be more devoted because they have a little bit of skin in the game. He said as much in an interview a long time ago. He phrased it differently but you get the gist.