Where does Fortnite get the money from, where is the prize money at the World Cup, and is it also the Cash Cup, through the income from the shop and sponsors or how is it?

Where does Fortnite get the money from, where is the prize money at the World Cup, and is it also the Cash Cup, through the income from the shop and sponsors or how is it?

Microtransactions. Billions of euro through small amounts (5-100 euro)

Fortnite is free.
The small packages that are bought (1-20 euro) are the revenue.
With the large number of players, there are a few billion a year, the few million for the event are for the peas