The homeless are certainly not a niche audience. There might be between 13 and 26 million people in the US alone who have experienced homelessness at some point in their lives [0].
Besides, issues around permanent access to security devices are not exclusive to the homeless. The problem described in TFA impacts a far larger segment of society.
Critical services are increasingly only available online -- and online services are increasingly critical. The people governing access to critical services are willfully ignorant to the difficulties that vulnerable people face, and often make those difficulties worse.