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I'm actually more curious on why a lot of directors receive $0, while others receive almost 1M

The ones getting paid are probably working full time for LF while the unpaid ones are just on the board and presumably have other jobs.

That seems to be correct. You can see the hours disclosure here: https://projects.propublica.org/nonprofits/organizations/460...

Directors sound like the Board, the others are Executive Directors (eg, they do the work).