Most of the stuff on the list is either so far out of achievable reach from its current stages, or just generic America-first proselytizing. What all of them have in common is that they require massive amounts of capital, the kind that most VCs don't have/aren't ready to invest. Those who have the capabilities to start a company targeting these problems are not the YC crowd of young college students and techies under 40 looking for cred - they are either folks who have massive amounts of dry powder to deploy, or have the connections who have that kind of capital to combine with their experience. In both cases, none of those guys are stupid to give away 7% of their company (effective 15%) for $500k.
It's kind of laughable how YC is now requesting for startups in these lines when 10 years back, they rejected us (DefTech) on exactly the above premise. While we didn't manage a multibagger exit, we did manage a non-acquihire exit, which is more than what most YC companies can manage. The right time to invest in these problems was 10 years ago, when all the low-hanging fruit still existed.