Details on IOTA and David - https://cointelegraph.com/news/founder-david-soensteboe-out-of-iota-foundation-after-unanimous-board-decision

References:

ada - https://www.reddit.com/r/CryptoCurrency/comments/jzty7p/daily_discussion_november_24_2020_gmt0/gdhjcx1/

coinbase - https://www.theblockcrypto.com/linked/85659/coinbase-discontinue-margin-regulation