Startups are not working on the big problems in education, healthcare, housing/homelessness, income inequality, etc. because those are not problems you can solve by bringing innovative products and services to market, they're problems you solve with different public policy.
The space of problems that could hypothetically be addressed by a free-market actor is pretty well tended already; it isn't crazy that we see free-market actors working on things that look unimportant.
The space of problems that could hypothetically be addressed by a free-market actor is pretty well tended already; it isn't crazy that we see free-market actors working on things that look unimportant.