There's racist stuff all over Google's biggest properties. Racist results on Google, videos on youtube, sites hosted on GCP. Give me a break with your fake trashy virtue signalling Google. This is nothing more than a monopoly stomping out a platform it doesn't like. Probably because federation is a threat to Google's position as the central hub of the internet.
Never attribute to malice that which is adequately explained by stupidity.
The real reason is that Google employees live in an ideological echo chamber where censoring anything that doesn't align with their ideologies is a completely normal thing to do. They think they're protecting the world from bad ideas, without noticing how they themselves promote other bad ideas.
Basically: the moralistic version of the Dunning-Kruger effect.