The minecraft launcher updates the splash file by itself with these messages:

https://resources.download.minecraft.net/79/79100a074bf2444ce2df0a464f77091d870f8a26

This file adds the splash messages:

Black lives matter!
Be anti-racist!
Learn about allyship!
Speak OUT against injustice and UP for equality!
Amplify and listen to BIPOC voices!
Educate your friends on anti-racism!
Support the BIPOC community and creators!
Stand up for equality in your community!

Political propaganda is unacceptable in a game that kids play. Especially not local political issues. Not everybody lives in the USA, how about a "Free Palestine" and "Free Hong Kong" message while we are at it?
It doesn't matter how justified you think your cause is or how you think its an universally good message, i do not want to explain to my niece why minecraft tells her to support the people who are on the news burning streets down and why people use anti-[bad thing] to justify violence.

You can support on twitter whatever you want. You can donate to whoever you want. But please keep your politics out of a game that children play.