I think they brief on it in the 6th slide &quot;Free, as in Free Market&quot;<p><a href="https:&#x2F;&#x2F;21.co&#x2F;learn&#x2F;21-marketplace&#x2F;#overview" rel="nofollow">https:&#x2F;&#x2F;21.co&#x2F;learn&#x2F;21-marketplace&#x2F;#overview</a>