How is this not obvious to the people here on HN? How do the people on here who constantly get holier than thou about demographics in tech not see the obvious machinations? Seriously, look around your office right now and then ask yourself again why top tech companies care more about immigrants than other oppressed groups.
What do you think is more likely, that Google genuinely cares about the immigration of farmers from Libya, or that they have a couple physics PHDs from Iran driving huge amounts of search revenue?
Corporations don't have morality, they have profit motives. YC doesn't give a shit about immigrant rights any more than the unjust deaths of african americans around the US, they care about attracting certain demographics to apply as founders.