@ChrisMayLA6 it is not just the federation which enabled this, to be clear.
There was a lack of interest in the development of suitable moderation tools at the time, a lack of black voices as part of the development and leadership of Mastodon.
A culture of telling people "they were doing it wrong" even though they were the victims of racism. There's a lot.. federation was a part of it, but a solvable part of it. In other words, to be clear, it was not a technology problem at it's heart