If they were snubbing Whites or Asians to help underrepresented groups, then they'd be exercising an unjustifiable racism. Merely going the extra mile to help another group however is not that. YC should do it, and anyone should happily accept an advantage offered to them.
This may be controversial as well, but the black founders I know are rich Ivy leaguers (granted I only know a few). They don't need extra help. (I know there probably are other black founders who didn't grow up in privilege who do not fit into that category.) I don't personally know any hispanic founders, my anecdotally-based sense of things makes me feel like they are urgently underrepresented.
This may be controversial as well, but the black founders I know are rich Ivy leaguers (granted I only know a few). They don't need extra help. (I know there probably are other black founders who didn't grow up in privilege who do not fit into that category.) I don't personally know any hispanic founders, my anecdotally-based sense of things makes me feel like they are urgently underrepresented.