Yes he is. There was a pedophilia ring operating on Twitter for years and an Anonymous person collected all of the information on everyone involved and sent it to Jack Dorsey. Instead of banning the pedophiles, the person who revealed them was banned, and the pedophiles were left untouched and continue to this day doing what they're doing.

Additionally, while I can't reveal specifics (to protect sources), work was done by a group of individuals interested in him and those he is close with and what was discovered was a "mailing list" that distributed writings to those who signed up for them in exchange for large amounts of money. However, there were no letters distributed - which means it's a method of laundering money.

Given all of this, there is a lot more to Jack Dorsey than Twitter.