There are no "review fees" (we review papers for free) and most editors (who select reviewers and select the papers) are not paid. So, basically, the cost is th

There are no "review fees" (we review papers for free) and most editors (who select reviewers and select the papers) are not paid. So, basically, the cost is the cost of a website. At any rate, to 'disrupt' conventional journals, you need to convince the big names to be the editors/reviewers (which is often hard!), in order to give some credibility to your new journal.