It is about time that corporations, with GitHub here as an example, noticed that backing this or that or another minority or "trying" to solve some medial issue only where it suits them PR-wise is simply abusing that minority in yet another way; it is a means of using that minority, and all the people who constitute that minority, as a tool for public relation stunts and political "but we support X, see?" newspeak that brings no actual change.
I'm genuinely curious if GitHub does support Black and Brown people enough to actually make that support noticeable for everyday lives of these folk.
It was not that long ago that any positive recognition of even gay people existing in modern media outside of farce, recognition by corporations was seen as a HUGE step forward as far as making people or concerns SEEN.
Maybe some CEO's out there are all Snidely Whiplash and putting out all their messaging for free PR, but I'm not going to assume that and I think the recognition is of value.