Links to his talk and speaker profile are dead.
https://fosdem.org/2025/schedule/event/fosdem-2025-4507-infusing-open-source-culture-into-company-dna-a-conversation-with-jack-dorsey-and-manik-surtani-block-s-head-of-open-source/
https://fosdem.org/2025/schedule/speaker/jack_dorsey/