I revised the footnote to make the Series A v.s B distinction. I also interpreted your comment to mean that series A investments were in voting shares but do please correct:
These investors were Dustin Moskovitz and Jaan Tallinn in Series A, and Sam Bankman-Fried about a year later in Series B.
Dustin was advised to invest by Holden Karnofsky. Sam invested $500 million through FTX, by far the largest investment, though it was in non-voting shares.
I revised the footnote to make the Series A v.s B distinction. I also interpreted your comment to mean that series A investments were in voting shares but do please correct: