“I have a disproportionate amount of money to share,” she wrote in her pledge.
Charity experts have applauded the amount she has given away and how she has done it. Ms Scott has worked with a team of advisers to research thousands of organisations.
“We leveraged this collective knowledge base in a collaboration that included hundreds of emails and phone interviews, and thousands of pages of data analysis on community needs, programme outcomes, and each non-profit’s capacity to absorb and make effective use of funding,” she wrote.
This year Mr Bezos has also been active with philanthropy, committing $10bn to issues related to climate change.
In November, he announced the first of those grants, handing out nearly $800m to 16 groups. Mr Bezos has seen his net worth increase $70bn this year to reach a fortune of $185bn, according to the Bloomberg Billionaires Index.
During the pandemic there has been a massive rise in online shopping benefitting online retailers such as Amazon. Swiss bank UBS said billionaires had done “extremely well” in the Covid crisis.