I think you would see that there would be lots of barriers for any individual who doesn't file a tax return.
Several years ago, my office did a report on access to benefits for vulnerable populations. That report actually identified that the federal system is very focused on gaining access to benefits once you've filed a tax return. This is a known barrier for many programs, not just this one.
We do identify, though, that there's data missing on other populations—people who are incarcerated and some indigenous populations off reserve. There's definitely opportunity to keep improving access to this program.