(The answer to the first one is provided below):

Elon Musk – “About half my money is intended to help problems on earth and half to establish a self-sustaining city on Mars to ensure continuation of life (of all species) in case earth gets hit by a meteor like the dinosaurs or WW3 happens and we destroy ourselves.’

1. Elong Musk
2. Jeff Bezos
3. Mark Zuckerberg
4. Bill Gates
5. Jack Dorsey
6. Aliko Dangote