I'd be interested to see this as a percentage of net worth or income as well. If a person with $1B gives it all away in one months that's about as philanthropic as you can get - much less so for someone with another $50B to spare. Tracking this on a "last month" basis with no information over time is just ridiculous too.

Also, the descriptions here seem pretty varied, and highly slanted.

eg. Balmer joined Microsoft when it was still a start-up, and just gets credited for the CEO years, rather than as helping grow it along the way.

Sergey Brin just has "Immigrant" for the second sentence. Martha Ingram "Author of three books". Neither of those provides any insight into the value that provided.

Overall that just makes the whole page look especially suspect, coupled with picking these 29 (or "About 30" as the About page puts it).

There's so little rationale here it makes the whole site look like advertising for something I can't work out.