I can provide you with some general information. Public libraries often aim to provide access to information and resources to as many people as possible, including those who may not have reliable internet access at home. Libraries may offer Wi-Fi services during their operating hours to facilitate access to digital resources, educational materials, and online services.

Regarding the issue of homelessness, it is a complex social problem that many cities, including San Francisco, grapple with. Homeless individuals may use public library services, including Wi-Fi, as a means of accessing information, seeking employment, or staying connected with others. Public libraries often strive to serve all members of the community, regardless of their housing situation.

However, decisions regarding Wi-Fi availability and its hours of operation may vary from one library to another, and local library policies can change over time. It's best to contact the specific library in question or refer to recent news or official announcements to get accurate and up-to-date information on their policies.