Because that article is from Forbes, it's obviously going to paint a rosy picture of the intrepid entrepreneur, firing his boss to strike out on his own.
However, I strongly suspect the majority (if not vast majority of the growth in self-employment is of the other kind: where someone who rightly should be a full-time W-2 employee either gets fraudulently misclassified as a 1099 independent contractor (and is too terrified of losing his job to complain), or where a person can't find a job at all and, out of desperation, farms out his time doing "microjobs" with things like Uber or TaskRabbit.
