Is Greta Thunberg working pro bono?

The 16 years old climate activist claims often to be working with no profit in mind. However, Thunberg listed here services as a speaker for $10-20 thousand on AAE.

Hypocrisy is a common denominator of many prominent climate activists.

https://www.allamericanspeakers.com/speakers/436519/Greta-Thunberg