This essentially means that smaller businesses, or even start-ups, find it harder to get work, as only well-established and well-promoted users get opportunities.
New users cannot pay for advertising and the new feature is only available to those who are ALREADY relevant.
The new feature will make it easier for larger businesses to win bids for jobs, which must have been difficult until now, as it was more likely to be won by those who were otherwise working at a lower price as start-ups.
Thus, fiverr gets a greater benefit from the 20%, as these sellers are already somewhat established in the market and working at a higher price.