https://www.motorsport.com/f1/news/the- ... t-1040023/
"That means there will be no traditional up front sanction fee, and instead there will be some form of revenue and risk sharing involving the F1 organisation, billionaire promoter Stephen M Ross and, presumably, the City of Miami."
So instead of paying about $30mil like every other track except Monaco and Brasil, Miami could pay nothing and just share proceeds from ticket sales and VIP packages.
But it does open a can of worms for Liberty.
This article is a very informative read.