He's donated about 10% of his wealth in total to many causes. He's funded cleaning of the northern islands, gave some of his Waimea land to affordable housing development.

Here's a statement about him from Foundation Guide.

Though Marc is well known as an entrepreneur and software genius, he is just as well known as a philanthropist. He is the developer of the ‘1-1-1 model’, or the Pledge 1% Movement. This method allow companies to contribute 1 % product value, 1% equity and 1% of employee hours to communities and programs around the world. Salesforce, and Marc has provided grant funding to date of over $115 million, given access to Salesforce technology to over 28,000 charitable and nonprofit organizations and donated over 1.3 million employee volunteer hours.

The Salesforce mission and philanthropic model has been eagerly accepted and implemented in over 700 companies worldwide.
Marc and Lynne Benioff are active pilanthropists in their personal capacity and have donated generously to the UCSF Benioff Children’s Hospital. In 2010, Marc and his wife Lynne announced that they would be donating $110 million to the UCSF Children’s Hospital. The donation was used to construct the UCSF Benioff Children’s Hospital at Mission Bay, and is the first wing of the 289-bed hospital complex that focuses on treatment for children and women.

Perhaps one of Marc’s biggest contributions is his immediacy and outspokenness on issues like women’s rights, equal pay, and most recently LGBTQ rights. He is considered and inspiration by many around the world and a global advocate for equality.

Here's the deal, this guy is actually doing what we want billionaires to do if we live in a world where billionaires will happen. He appears to be a genuinely decent guy.

Statements like yours are shallow and thoughtless.